Top Definition
v: when a man uses his thumb to help ease his limp penis into a vagina -- this act is often performed while drunk and resembles the operation of a shoehorn fitting a foot into a shoe
I drank 37 beers last night and there was no chance I was going to get hard. I definitely had to thumbhorn the bitch.
by thebozak June 05, 2006
7 Words related to thumbhorn

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