Green’s Dictionary of Slang

fatso n.

(orig. US)

1. a general derog. term addressed to a fat person.

[US]S.J. Perelman ‘How Sharper Than a Serpent’s Tooth’ in Keep It Crisp 140: Get in the groove, fatso.
[US]R. Chandler Long Good-Bye 123: Out of the way, fatso.
[US]L. Bruce How to Talk Dirty 145: You were sick, weren’t you, fatso?
[US]D. Goines Inner City Hoodlum 135: You little black fatso ... you’re dead, boy!
[UK]M. Thelwell Harder They Come 257: If it’s a killing you want Fatso, it’s a killing you get.
[UK]K. Sampson Powder 350: Ah, shut it, fatso!
W. Whichelow Notso Fatso 1: Ahoy, there, Fatso!

2. a fat person; thus a nickname.

[US]J.E. Hoover Persons in Hiding 104: A fellow worker named Fatso Negri recognized a ‘wanted’ picture in a detective magazine.
[US]R.L. Bellem ‘Phoney Shakedown’ Dan Turner - Hollywood Detective Feb. [Internet] I thought it was Fatso Venner who drilled her on that forecourt.
[US]P. Whelton Angels are Painted Fair 45: Not that I think Mr. Fatso would leave the office alone.
[US]J. Jones From Here to Eternity (1998) 615: If Fatso tells you to eat a plate of shit, you eat it, and whats more, you like it, hear?
[US]E. De Roo Big Rumble 113: ‘You shoulda kissed her goodnight,’ Larry told him. ‘Yeah. Let Fatso White do it,’ Donald snarled.
[US]‘Iceberg Slim’ Airtight Willie and Me 12: Willie walked, with head down, toward a florid fatso.
[US]‘Joe Bob Briggs’ Joe Bob Goes to the Drive-In 80: Another one is this fatso named David, who has a lot of money.
[US]L. Stringer Grand Central Winter (1999) 37: Fatso waddles up to our cell, asks a question.
[US]J. Stahl I, Fatty 115: The perpetual happy-go-lucky fatso funster.