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?

Mary Poppins Bag by 123allthekidsbulliedme March 5, 2019

Fanny like Mary Poppins' bag 

A fanny which appears smaller on the outside than the inside. A very perceiving growler. A very spacious vagina.

Thought she was a standard one but nahh she had a fanny like Mary Poppins' bag

Fanny like Mary Poppins' bag by Barry Shaazaaam November 4, 2010

Mary Poppins's Carpet Bag 

A cavernous hole Big gash A clown's pocket A wizard's sleeve

She has a fanny like Mary Poppins's Carpet Bag!

Mary Poppins's Carpet Bag by Chilly Beef March 13, 2019