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Comes from the initials "FZ" meaning Friend Zone. It can be a male or female. If you have a girl/guy who's put you in the Friend Zone, he/she is your "fonzi".
Man! That girl is hot! Too bad she's just one of Joe's FONZI's.
fonzi by PeterPan425 November 5, 2013
an extremely handsome man, very caring and considerate. he is usually a very spectacular person and will show you the finer things in life. he has a very sweet side but won’t show it but also has a very mean side.
girl: boys are so disgusting
girl 2: yea unless their name is fonzi
fonzi by liteolit February 18, 2021

Fonzi Scheme 

The act of defrauding a restaurant owner of the cash from their juke box.
Big Al's was robbed of dozens of dollars when it was discovered that Arthur Fonzarelli had been playing songs for free by merely punching the juke box, otherwise know as a "Fonzi Scheme". When contacted at his office in the men's room at Big Al's restaurant, Fonzarelli had no comment
Fonzi Scheme by angusshangus January 7, 2009

dirty fonzi 

The act of inserting a thumb into the anus during intercourse. Inspired by the Happy Day's character,Arthur Fonzerelli, who was fond of giving the thumbs up and uttering "Aaaaaaa(nus)."
"We were doing it doggy style when Christian decided to give me a dirty fonzi! I felt so violated!!"
dirty fonzi by Madamasselle March 1, 2003
A old time greaser.
An over the hill hood.
Hey, check out the old guy, he's 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