What is Selectively Permeable Membrane?


1.

A hot girl's vagina.

Very selective on who's dick is permitted through the membrane (her pussy lips.)

Will often deny nervous, non-jock types. The membrane judges largely on physical appearance, not on the pretense of a good personality or wit.

Guy 1- So did you sleep with Elena in the end?

Guy 2- No, she had a selectively permeable membrane.

Guy 1- ... So she turned you down?

Guy 2- Yeah.

Guy 1- Well just say that then!

Guy 2- I needed to make an example for a definition for urban dictionary, okay?!

Guy 1- Oh, right... Wait a minute, am I on TV?!

See hot girl, vagina, picky, hard to get, biology


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