1.)Anyone in the Prince of Tennis fandom.

2.)Fangirls

3.)Yaoi Fangirls

4.)BNF's

5.)Anyone who ships fictional characters together.
Bobbissimo is a Mc Fatty, who has jiggy arms.

Prince of Tennis fangirls are all Mc Fatty's.

by bookshop July 13, 2007
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usually referred to fat people with dildos up their asses
Me: Hey Fatty Mc Dildo got beans?
Fatty Mc Dildo: Ya fucked a dildo today, why?
Me: get in the bin.
by Fake news April 4, 2017
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a person who is so fat that they cannot ride a single ride at disneyland
THe lady who was holding the bag of cotton candy was a fatty mc faticuss all she could do was sit and eat that shit.
by Juanita delarose February 7, 2009
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A huge dog that people let get overweight. If it can stand up then nobody will ever break into your house.
Qwerty: "My dad has a friend with a fatty mc fat fat fatty fat dog fat."

Asdf: "Holy shit, can it walk?"

Qwerty: "No, so he has to get carried up the stairs to the house. He's really nice though."
by etaN retsaM March 28, 2008
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A very nice (nick)name... for someone who is overweight and very very chunky
You! Yeah, you over there! Look at chu all fat yo ima call you Fat Fatty Mc Fat-Fat ya digg?
by brandyy August 26, 2006
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so fat wow fatty mc watty
yeah. fatty mc fatty watty
by Ileeah February 12, 2023
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