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Swish is a US English slang term for effeminate behaviour and interests (camp), emphasized and sanctioned in gay male communities prior to the Stonewall riots. This behaviour is also described as being nelly in British English, and both terms are often considered to be derogatory.
Being swish stereotypically includes sashaying and the use of falsetto voices, feminine pronouns, and superlatives. According to Martin Levine and Michael Kimmel in Gay Macho: The Life and Death of the Homosexual Clone:
Extravagant language is common. Such expressions as "Oh my word!" "Good heavens!" and "Oh, my dear!" are readily associated with other aspects of a feminine man. In describing ordinary experiences the male variant is likely to use words as "terrific," "amazing," "completely devoted," "horrible," "tremendous," "sublimely," "charming," "appalling," "vicious," "loathed," and "madly." Exaggerations are made more conspicuous by placing undue or erroneous emphasis on certain syllables and intonations which leave little doubt of the effeminacy of the speaker 
Status after the Stonewall riots
Although being butch was viewed as deviant and socially unacceptable by gay male society, being swish has since lost its mainstream gay status post-Stonewall, and in addition to being used occasionally by mainstream culture is now most often derogatory even when used by gay men. Though it may be assumed that most post-Stonewall gay men[clarification needed] view acting swish as internalized homophobia, a concession to stereotypes of gay men as less than manly. However, the Castro clone, a hyper-masculine, macho standard and ideal behaviour that replaced swish, adapted many camp elements such as dishing.
Thus while clones could view swish as embodying anti-gay stereotypes, being swish was a way of indicating and performing one's identity, indicating that anti-gay stereotypes could be derived from gay identities. Further, one could turn swish on or off, as described in Gay Macho: The Life and Death of the Homosexual Clone:
Just look at all these clones dear. With their pumped up bodies and thick moustaches, they all look so 'butch.' But I remember when everyone was 'nelly'. What a joke! [...] Over the last few years I have watched many of these girls change as the times changed. A couple of years ago, they had puny bodies, lisping voices, and elegant clothes. At parties or Tea Dances, they came in dresses, swooning over [Greta] Garbo and [Bette] Davis. Now, they've 'butched up,' giving up limp wrists and mincing gaits for bulging muscles and manly handshakes, giving up fancy clothes and posh pubs for faded jeans and raunchy discos.
Modern LGBT rights movement
Most recently, swish has taken on an empowering and action-oriented meaning within the LGBT rights movement. To swish is to create opportunities for straight allies to become active in the LGBT civil rights movement. It embodies a form of activism that is uplifting, rewarding and fun.
- "swish definition, meaning". dictionary.cambridge.org. Cambridge Dictionaries Online. Retrieved 20 February 2015.
swish noun [C] (LIKE A WOMAN) › US slang disapproving a man who behaves or appears in a way that is generally considered more suited to a woman, and who does not have traditional male qualities
- "swish - Gay Slang Dictionary". Retrieved 28 February 2015.
swish #n. To overplay or over do homosexual gestures; the traits of an effeminate male homosexual. Source: [1930's] #Passive homosexual. #To walk speak or move in the manner of an weak effeminate boy or man; the stereotype effeminate homosexual.
- Stanley, J. P. (1974) "When We Say 'Out of the Closets!'" College English, 36, 7.
- Kleinberg, Seymour. "unknown article." Christopher Street, March 1978. Cited in Levine 1998.
- Levine, Martin (1998). Kimmel, Michael, ed. Gay Macho: The Life and Death of the Homosexual Clone. New York University Press. pp. 22–56. ISBN 9780814746950. Retrieved 20 February 2015.
- Wentworth, Harold and Stuart Berg Flexner. Dictionary of American Slang. Thomas Y. Crowell, 1967. Wentworth and Flexner define swish as a noun meaning "a male homosexual, esp. one with obviously feminine traits"
- "Definition of "Nelly" by Oxford Dictionaries Online". .oxforddictionaries.com. Oxford Dictionaries Online. Retrieved 23 February 2015.
2. offensive An effeminate homosexual man.
- Sonenschein 1969; cited in Levine 1998
- Tripp 1975, 180-182; cited in Levine 1998
- (Henry, 1955, p. 291, cited in Levine 1998)
- (Warren 1972, 1974; Helmer 1963, both cited in Levine 1998)
- Loftin, Craig M. "Unacceptable mannerisms: Gender anxieties, homosexual activism, and swish in the United States, 1945-1965." Journal of Social History 40, no. 3 (2007): 577-596.
- Stiffler, Scott., (Friday, June 18, 2004). Straight Gals Dish on Why Gays Make Great Pals. Chelsea Now (online).
- Swish: My Quest to Become the Gayest Person Ever by Joel Derfner, Broadway Books, 2008.