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1.
A old time greaser.
An over the hill hood.
Hey, check out the old guy, he's a fonzi.
von Robert Michael. Hensel 17. April 2008
 
2.
Sexual act in which the male participant inserts one thumb in the female participant's vagina and the other in her rectum, while saying "Heeeyyeee!" like the character from the popular television show "Happy Days".
Dude, last night I gave Stephanie a Fonzi and she went nuts!
von Bobby Joe Wilson 20. April 2008
 
3.
Sexual act in which the male participant inserts one thumb in the female participant's vagina and the other in her rectum, while saying "Heeeyyeee!"
Dude, last night I gave Stephanie a Fonzi and she went nuts!
von Mister dbagg 18. April 2008