Used to describe something, someone or an event which is really annoying or stupid. Has more of a powerful meaning than calling someone a "piece of shit".
Dude 1: OMG, I hate you!
Dude 2: WTF MANNNNN!!! BITCH!! OIAHDOASIHFSJ!!
Dude 1: Chill man.
Dude 2: OMFG NO WAY YOURE SO FUCKING MEAN *does two backflips* god!!!!
Dude 1: uh whatever. .
Dude 2: OMG DONT USE THAT TONE WITH ME YOU MOTHERFUCKAAA *rolls on the floor*
Dude 1: *calls dude 3* "Dudeee. 2 totally just had a shitfit."