Top Definition
german word for "pilonidal cyst".

a steissbeinfistel is an inflamation at the top of your ass that builds little channels in your skin to spite out the matter.

if you once get this disease you should go to a surgeon. the surgeon will cut a big piece off you ass. if you're a lucky one it won't never come back.
fistel-victim: "treasure, I got a pilonidal cyst!"
treasure: "gfy!!!!111!!"
by poop April 16, 2005

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