money shot

Etymology
So named because it is often considered the most important part of the film, and often an actor who is unable to provide the shot goes unpaid.

Noun

 * 1) The shot or scene of a film that cost the most to produce, most commonly an action sequence.
 * 2)  The moment in a pornographic film where the male subject of the scene in question ejaculates.
 * 3) * 2011 , "1 Night in Gottlieb" (season 1, episode 2):
 * Allen Gregory DeLongpre: Uh-oh, Principal Gottlieb. Looks like somebody forgot their danish, huh?
 * Judith Gottlieb: Aw, crap.
 * Allen Gregory: Three, two, one, and there's the money shot.
 * 1)  The release of semen on the partner's body, especially on the face or in the eye.