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The term off-color humor (also known as vulgar humor or crude humor) is an Americanism used to describe jokes, prose, poems, black comedy, blue comedy, insult comedy, cringe comedy and skits that deal with topics that are considered to be in poor taste or overly vulgar. Most commonly labeled as "off-color" are acts concerned with sex, a particular ethnic group, or gender. Other off-color topics include violence, particularly domestic abuse; excessive swearing or profanity; "toilet humor"; national superiority or inferiority, pedophilic content, and any other topics generally considered impolite or indecent. Generally, the point of off-color humor is to induce laughter by evoking a feeling of shock and surprise in the comedian's audience. In this way, off-color humor is related to other forms of postmodern humor, such as the anti-joke.
Off-color humor was used in Ancient Greek comedy, primarily by its most famous contributor and representative, Aristophanes. His work parodied some of the great tragedians of his time, especially Euripides, using sexual and excremental jokes that received great popularity among his contemporaries.
Another one for the endless sexual jokes was William Shakespeare, the 16th-century playwright and poet. Almost every one of his plays contains suggestive jokes and innuendo.
Jonathan Swift, an Irish satirist in the 17th century, used scatological humor in some of his pieces, including his famous essay A Modest Proposal and his rather crude poem "The Lady's Dressing Room", in which the speaker comments on the goings-on in a 17th-century woman's room, including her business in her chamber pot.
Dirty jokes were once considered subversive and underground, and rarely heard in public. Comedian Lenny Bruce was tried, convicted, and jailed for obscenity after a stand up performance that included off-color humor in New York City in 1964. Comedian and actor Redd Foxx was well known in nightclubs in the 1960s and 1970s for his raunchy stand-up act, but toned it down for the television shows Sanford and Son and The Redd Foxx Comedy Hour, stating in the first monologue of the latter show that the only similarity between the show and his nightclub act was that "I'm smoking". American society has become increasingly tolerant of off-color humor since that time. Such forms of humor have become widely distributed and more socially acceptable, in part due to the mainstream success in the 1970s and 1980s of comedians like Peter Cook and Dudley Moore's alter-egos Derek and Clive, Dolemite, Andrew Dice Clay's "The Dice Man", and Richard Pryor.
In the 1990s and modern era, comedians such as George Carlin, Bill Hicks and Dave Chappelle have used shocking content to draw attention to their criticism of social issues, especially censorship and the socioeconomic divide. The cartoon Beavis and Butthead was especially off-color in its early episodes, which included numerous depictions of animal cruelty. The highly-praised television show South Park also popularized the use of offensive humor, for which the show has become infamous. The Aristocrats is perhaps the most famous dirty joke in the US and is certainly one of the best-known and most oft-repeated among comedians themselves. Tom Green has used Shock Humor in The Tom Green Show and Freddy got Fingered, By doing outrageous stunts and jokes to Draw an audience in.
In British humor, the genre of "sick jokes" is often used to shock by poking fun at taboo or as a reaction against political correctness. Examples include the website B3ta, the humor wiki Sickipedia and its accompanying book The Bumper B3ta Book of Sick Jokes, and the adult comic Viz.
Veg and non-veg jokes 
In some parts of the world, sexual humor in particular is known as "non-veg" humor, contrasted with the "veg" jokes that are more acceptable in polite company. The use of the term "non-veg" is probably a reference to the carnal nature of sexual humor, and can be viewed in the context of the prevalence of both vegetarian and non-vegetarian dietary preferences in India.
See also 
- Manuel, compiled by Rob (2006). The bumper b3ta book of sick jokes. London: Friday. ISBN 978-1-905548-28-6.
- Kanak Hirani Nautiyal (9 Jun 2005). "Porn again and again". Times of India (Times Internet Limited). Retrieved 2009-04-11.
- Joginder Tuteja (November 24, 2006). ""Even critics laugh at non-veg jokes" - Sangeeth Sivan". IndiaGlitz (IndiaGlitz). Archived from the original on Dec 14, 2007. Retrieved 2009-04-11.