The act of being haunchy. Can be used as a verb, adjective, noun, state of mind. Haunches are fun loving, passionate, sarcastic, forgiving, playful, and love to tickle fellow haunches once they get them right where they want them.
State of mind, as in: "Your not being very haunchy right now."
Verb: "Let the haunches kick back."
Noun: "What up haunch?"