Top Definition
A girl that has had sex with 2 or more of your friends.

If the girl has had sex with 3 or more of your friends she is considered a slippery otter stuck in an oil spill.
me: wow kate slept with both of us this week, what a slippery otter!
friend: she also slept with max last week. that slippery otter is stuck in an oil spill, and i don't think that grease is coming off for a while.

origin: santa cruz california
by TDW 45 October 25, 2010
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