Top Definition
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.
by DragonSlayer45 February 17, 2011

Free Daily Email

Type your email address below to get our free Urban Word of the Day every morning!

Emails are sent from We'll never spam you.