A pissy fit is a dramatic demonstration of bitchiness exhibited by small effeminite homosexual males. Often accompanied by a flailing of limp wrist, hip thrusting, stomping of platform shoe, and some combination of the following phrases sputtered in a lisp: girlfriend, fierce, hoe, and biatch.
That queen had a pissy fit cuz the bouncer wouldn't let his heffer fag hag leaver her purse on the dance floor.
The hissy fit you throw when you need to take a piss and are very far from a toilet.
Son: Dad, I think you missed the pit stop exit 50 miles back
Dad:!$#%, I have to piss...
Son: Geez, stop throwing a pissy fit.