Mary Poppins Bag

This occurs when a male collects a large quantity of his own ejaculate in one large container (the Mary Poppins Bag). A common use of the Mary Poppins Bag is to be tossed into an unexpecting female during their gynecology appointment - exploding on impact.

Erik: (casually) Yo I just gave Lindsay my fat 'Mary Poppins Bag' on Wednesday.
John: (disgusted) You are actually a disgusting human being... (Curious) Did you film it?