a fonzie 

when fingering your partners ass with your thumb right before he/she orgasms the partner exclaims in particular Fonzie fashion the coined term that made him so famous AAAAAAAAAAAAAAAAAAAA!!!!!!!!!!!!!!!!

A Fonzie in the ass is worth two in her bush!!!!

a fonzie by coolrelax69 April 15, 2005

a Fonzie 

The act of smearing poo on someone to give them sideburns. Usually done in their sleep. Much like a "Dirty sanchez" or "Hitler".

Chris got a fonzie last night, and it smeared all over his pillow.

a Fonzie by Noah April 7, 2004

A Fonzi 

A old time greaser.
An over the hill hood.

Hey, check out the old guy, he's a fonzi.

A Fonzi by Robert Michael Hensel April 17, 2008

A Fonzi 

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!

A Fonzi by Bobby Joe Wilson April 20, 2008

A Fonzi 

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!

A Fonzi by Mister dbagg April 18, 2008