when a man takes a small shit in the mouth of his partner and then procedes to mouthfuck her (/him?), in a motion that could be interpreted as the male trying to force the shit down his partner's throat with his dick, as one would use a plunger on a toilet.
Plunger is the opposite of the shocker. The plunger consists of two fingers, usually the ring and pinky inserted into a girl's ass with the index finger inserted into her vagina. Often used during church or important business meetings with Japanese clients.
Father Joe gaveJenny the plunger while watching a Menudo video.