a person who fucks up a party due to his inability to handle his drinks, consequently making a complete ass of himself by constantly provoking fights and screaming "LET'S GOOOOOOOO" at every guy, girl, cops, cats, dogs, chairs, lamps, etc.
The new catchy catch phrase that everyone is just itching to use! Someone drops their drink? Be sure to be the quickest to blurt out "OHHH, PARTY FOUL" and you win extra cool points with all the ladies, and possibly the men too! Practice being quick off the mark by dropping glasses in your own home! Try to train yourself to say it reflexively on hearing the glass shatter! Then open your wrists with a shard from that glass and try again! Repeat until dead!
(Ko-bee Fa-ool) Noun - An over reaction of a situation, much so acting like a victim, in order to draw something for their own benefit.
Made popular by Kobe Bryant in which he shoots a J, lifts his knee into the defender - drawing contact (forced by Kobe), and then acting like he was fouled once the ball leaves his hand. Which typically, the referees do fall for it.
Examples of a Party Foul include dropping your drink, being a tool, yacking on the floor, dancing like a tool, hitting on an ugly broad, popping your collar, wearing excessive pink, not holding a beer, and refusing to funnel or shotgun a beer. You can see these examples at PartyFouls.com