Top Definition
A sock that has been used for masturbation; Often used as an insult to someone that is basicly, "a party crasher". It is similar to the phrases "Wet Blanket", "Stick in the mud", Etc.
1. Stop being such a stiff sock, and come on!

2. That guy is totally a stiff sock.
by Homicidal Artist June 10, 2007
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