A girl whose pussy is so loose and flobby(probably from being a slut)that she could jump off a building spread her pussy and use her pussy to float down to earth slowly.
Dillon: Did u get any from that chick last night?
Chris: Hells ya i did, but shes pretty much the biggest Mary Poppins ever!
by NiPz Is MyHerO November 12, 2005
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A girl who is interested in you who does not call before she just "pops in" to your pad.

Usually a girl who you are not interested in who's act you consider annoying.
Billy: "So what did you do last night?"

Tommy: "Nothing fun, Mary Poppins stopped by and I was cornered into hanging out with her."
by Aaron Goodyear July 27, 2005
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A gruesome sex act that involves the opening of an umbrella inside the orifice of another individual.
Karen was rushed to the emergency room after Bob decided to surprise her with a Mary Poppins for their anniversary.
by Chris_L July 21, 2020
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Shoving one's fist into a vagina and then opening the hand up, like an umbrella.
Bobby got his girlfriend, Sue, really drunk, and gave her a Mary Poppins.
by LEBOWSKI99 November 23, 2009
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plural for boob, tit, breast
Zach: Hey Jeff, check out the Mary Poppins on that one!
Jeff: I'd love to squeeze 'em together and make a Mary Poppin!
by Rohit Pathak March 24, 2008
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(1) A purse containing everything but the kitchen sink!
(2) A purse that one must pull out the strangest items in order to get to what they're looking for.
(3) A purse that is tiny, but apprears to hold huge amount of items in it.
(4) A purse one must dump out the entire contents of to get one small item out.
I got stuck behind a woman with a Mary Poppins Purse at the supermarket. This crazy lady had to take out everything in her purse just to get to her wallet. She had playing cards, toothpaste, hand sanitizer, dental floss, 3 bottles of pills, and whole lot of other junk just dumped on the counter. It was a small purse, too. I can't believe it holds all that stuff!
by DeWinter June 11, 2007
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A psychological disturbance, usually starting in childhood, wherein a person eats teaspoons of sugar back to back, practices telekinesis in order to clean up their room and periodically jumps off rooftops holding an open black umbrella.
It first became apparent to me at about the age of 12, as my parents were divorcing, that I was suffering with a deeply rooted and seriously advanced case of Mary Poppins Syndrome!
by Dr Bunnygirl June 30, 2020
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