When a song has beautiful lyrics or chords, to the point of making you cry. But then the drop is so heavy, that you want to headbang. So you simultaneously cry and headbang at the same time.
Simultaneously crying and masturbating, the most pathetic act a human being can engage in alone. Usually but not always takes place in a dark and empty room, ideally in a house that is just being moved out of.
Michael: Hey, Matt, I hear you and your girlfriend aren't fucking anymore.
Matt: Ya, I'm gonna go home and crybate.