A common abbreviation for the t.v. show Its Always Sunny in Philidelphia.
Todd: "Hey man did you watch the Sunny marathon last night?"
When you finger (preferably with your thumb) a girl in the asshole while she's driving and you are in the passengers seat.
I bet Finch gave Stifler's mom a nasty Hitchhiker's Thumb on the way back from that cabin in American Pie 2.
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