Having pores or openings that permits liquids/gases to pass through
Gravel, sand, and soil are permeable.
by Tiger128 May 8, 2009
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adj. something of average quality
-Would you say this kase is pure or impure?
-eh, semi-permeable

-That girl is neither a pig nor a princess, she is semi-permeable!
by ron joremey March 4, 2005
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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?!
by uwanttruthitellz May 10, 2009
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A very rare condition where the skin of a person is semi permeable. The skin therefore allows the transfer of small objects through it and into the body
Around one in every 500 million people have semi permeable skinitus.
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