A punch that is delivered to the buttocks of one who has his/her bottom in a protruding position. This punch can only be achieved with a minimum of 3 people and requires a conventional method of execution.
Person 1: "Butt punch!"
Person 2: *Delivers the punch to the extended posterior of Person 3.*
Person 3: "AHHH SHIT!"
A party game usually played with only guys. Each player pumps HI-C Fruit Punch into his asshole. Players start on one side of a room. They must run to the other end and squeeze the fruit punch out of their asshole into a cup. The player with the least amount of punch in his cup must drink both cups.
I got wasted at that party. We played butt punch and I lost every time.