Collision detection, used in video games. When an object in a video game strike or make contact with another, it is the collision detection or clipping thaw detects this.
Clipping is a penalty in American football in which a blocker will hit a non-ball carrying opponent from behind and below the waist. Not to be confused with block in the back, which is essentially the same thing but the contact occurs at or above the waist.
Guy1: Hey, what are you doing tonight?
Guy2: I'm taking this new girl I'm clipping out tonight.
Guy1: Aw sweet she got any sisters?
Guy2: Naw, sorry bud.
Guy1: It's alright, it looks like another night of smackin it...