The Fonzie 

When you shove your thumb up a girls ass and yell "Aaaaayyy!"

Toyna loves the Fonzie.

The Fonzie by jw1973 April 20, 2008

The Fonze

When you are doing a chick from behind, you shove your thumb in her ass and yell, "Heeeeeeeeeeeeeeeeeyyyyyyyyyyyyyyyyyyyyyyy"

While doing my chick i asked her if she likes Happy Days, when she questions it, you give her the Fonze

The Fonze by ElMartiniMan December 13, 2009

the Fonze

The act of shoving both your thumbs into a females anus and saying, "AAAAAA!"

Bill: Remeber that dishrag whore form the bar last night?
Tom: Yeah.
Bill: I gave her the Fonze.

the Fonze by mrducks December 19, 2003

The Fonzi 

After you bust a nut in a girls mouth you cock slap her in the face, put two thumbs out and say "heeey" like the Fonz in happy days.

Nancy was blowing Thad in the back of his 1975 thunderbird and he proceeded to give her the Fonzi.

The Fonzi by Big C-Ron August 19, 2007

The Fonzie 

While enjoying a cigarette after a night of intense sex, look your partner in the eyes, point at them with both fingers, and moan out "AYYYYYYYYYEE" in your best Fonzie impression, cigarette between your teeth

Friend 1 : "Yea so we fucked all night and then she pulled The Fonzie on me"
Friend 2 : Marry her, my dude"

The Fonzie by Chapö February 27, 2018