named for the megalodon, it is used to describe injuries that were accidentally self inflicted. like shooting a hole in your hand while cleaning a pistol, or slicing a chunk out of your thumb trying to whittle a block of wood.
guy1- "I mega'd my hand yesterday"
guy 2 "how did that happen?"
guy1- "there is a reason lawnmowers have that "dont put your hand in here" picture on them"
passenger 1: shotgun!
passenger 2: not bitch!
passenger 3: not bitch!
passenger 4: fuck i'm bitch. At least im not super mega donkey bitch.
passenger 5: fuck my life