Language Points
My friend drank too much, and started acting like an ass.
jerk/asshole
The waiter was such an asshole I decided not to give him a tip.
kiss one's ass
He kissed the teachers' ass all year.
kiss my ass
piss sb. off
An aggressive driver who is angry at another car may yell kiss my ass out of the window.
jackass
I hate it when a party was ruined by somebody being a jackass.
party boiler