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
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.