A Heyoka (in Lakota, Heyókȟa, also spelled "Haokah," "Heyokha") is a trickster spirit, a contrarian, jester, satirist or sacred clown. The Heyoka spirit speaks, moves and reacts in an opposite fashion to the people around it.
Heyókȟa are thought of as being backwards-forwards, upside-down, or contrary in nature. This spirit is often manifest by doing things backwards or unconventionally — riding a horse backwards, wearing clothes inside-out, or speaking in a backwards language. For example, if food were scarce, a Heyókȟa would sit around and complain about how full he was; during a baking hot heat wave a Heyókȟa would shiver with cold and put on gloves and cover himself with a thick blanket. Similarly, when it is 40 degrees below freezing he will wander around naked for hours complaining that it is too hot. A unique example is the famous Heyókȟa sacred clown called "the Straighten-Outer":
He was always running around with a hammer trying to flatten round and curvy things (soup bowls, eggs, wagon wheels, etc.), thus making them straight.
The Heyókȟa symbolize and portray many aspects of the sacred, the Wakȟáŋ. Their satire presents important questions by fooling around. They ask difficult questions, and say things others are too afraid to say. By reading between the lines, the audience is able to think about things not usually thought about, or to look at things in a different way.
Principally, the Heyókȟa functions both as a mirror and a teacher, using extreme behaviors to mirror others, thereby forcing them to examine their own doubts, fears, hatreds, and weaknesses. Heyókȟas also have the power to heal emotional pain; such power comes from the experience of shame — they sing of shameful events in their lives, beg for food, and live as clowns. They provoke laughter in distressing situations of despair and provoke fear and chaos when people feel complacent and overly secure, to keep them from taking themselves too seriously or believing they are more powerful than they are.
In addition, sacred clowns serve an important role in shaping tribal codes. Heyókȟa's don’t seem to care about taboos, rules, regulations, social norms, or boundaries. Paradoxically, however, it is by violating these norms and taboos that they help to define the accepted boundaries, rules, and societal guidelines for ethical and moral behavior. This is because they are the only ones who can ask "Why?" about sensitive topics and employ satire to question the specialists and carriers of sacred knowledge or those in positions of power and authority. Their role is to penetrate deception, turn over rocks, and create a deeper awareness.
For people who are as poor as us, who have lost everything, who had to endure so much death and sadness, laughter is a precious gift. When we were dying like flies from white man's disease, when we were driven into reservations, when the government rations did not arrive and we were starving, watching the pranks and capers of Heyókȟa were a blessing.
In Lakota mythology, Heyókȟa is also a spirit of thunder and lightning. He is said to use the wind as sticks to beat the drum of thunder. His emotions are portrayed opposite the norm; he laughs when he is sad and cries when he is happy, cold makes him sweat and heat makes him shiver. In art, he is depicted as having two horns, which marks him as a hunting spirit.
When a vision comes from the thunder beings of the West, it comes with terror like a thunder storm; but when the storm of vision has passed, the world is greener and happier; for wherever the truth of vision comes upon the world, it is like a rain. The world, you see, is happier after the terror of the storm... you have noticed that truth comes into this world with two faces. One is sad with suffering, and the other laughs; but it is the same face, laughing or weeping... as lightning illuminates the dark, for it is the power of lightning that heyokas have.
- Wilson D. Wallis. Heyoka: Rites of Reversal. Lakota Books, 1996 reprint.