1) When, at a desk, a male becomes aroused to the point where the bulge is prominent and is suddenly forced to stand, an unavoidable and painful collision occurs between said package and the lip of the desk.
2) Screwing up to an embarrassing degree.
"I was so focused on the Lt's boobies, I didn't hear the Colonel was coming until they called the room for the bastard. I shmized the wang somethin awful on that one."