The sound made when one executes a traitor. When doing so, gesture with your hand as if using a pistol. Usually done in groups. Being a traitor is highly variable, depending solely on the mood and whatever action is performed. Jocular in usage.
a word used by skater kids to define when they think a person is gay. They will often tell the "gay-ee" that they want to write zap on their arm has a right of passage into their 'group'. However, once other skater kids sees the ZAP written on the arm, they are rude to the kid.
Dave was a nice non-gay young man, but Andy thought to himself "Man, that guy is one nasty fag!" and Andy tricked Dave into letting Andy write ZAP on his forearm. Then Dave was teased.