A fold in the crotch of girls jeans that pops up when they sit down. The resulting image looks as if the girl has a small but erect penis in their jeans.

This fold shows up because the zipper of the jeans remains somewhat stiff while the denim wrinkles tightly when the fabric is compressed from sitting.

The same fold appears on men's jeans as well, however it is common to see humps in the crotch region of a male. Special note is taken when it happens to a female.
Jill: Lizzy! What's that in your jeans?!

Lizzy: Oh, that's just my genie weenie.
by Biggie-E December 11, 2007
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A man who likes to have sex with men.
Those two guys making out are weenie genies.
by the david thomas April 6, 2008
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Somone that can make an old fashioned aka hand Job an absolutely magical, nut busting experience.
Rachel put on a furry glove last night has gave me a handy. It was incredible. She’s a weenie genie.

Dude your mom’s hands are so soft they are like butter stroking my knob. She’s a weenie genie.
by Eaton Holgoode November 4, 2017
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