What is Stink Willy?
1.
To lick your finger, insert it in someones anus, and twist it around in the fashion of a Wet Willy.
Dude: "I was getting my girlfriend doggie style when I gave her a stink willy!"
Bro: "You licked your finger and stuck it in her butt?"
Dude: "Totally!"
Bro: "Bro Grabs!"
See