mungfishing
A supposed act of necrophylic sex in which a person digs up a dead woman and performs cunnilingus on the body while another person (the mung-jumper) jumps off a ladder or other high object, landing on the stomach of the corpse.
You and Carl went mungfishing? You're fucking sick. I hope the cops bust you.
Mungfish
A random word, or an insult. It means someone who it stupid or dumb.
Guy 1: Dude, you're a mungfish.
Guy 2: No i'm not!
Guy 2: No i'm not!