Green’s Dictionary of Slang

tubby n.

[SE tubby adj.]

(US) a fat person, often used as a (usu.) affectionate nickname.

[UK]C. Hindley Life and Adventures of a Cheap Jack 147: My first meeting with William Last, alias ‘Tubby,’ was at Brighton.
[US]Wichita Eagle (KS) 17 July 4/3: In picking a ball from the three which were offered, Tubby says, ‘gimme de soft wan.’ Tubby is a batter too.
[US]Sun. Herald (Wash., DC) 14 Sept. 5/2: ‘Tubby’ Dickinson came up with his bat.
[UK]‘R. Andom’ Martha and I 217: Tubby Jenkins has been and gone and hypnertised these fellers.
[US]Central Record (Lancaster, KY) 6 Mar. 1/5: ‘Tubby’ Wilkerson, appeared [...] in a cracker-tail coat, doe skin breeches and a bee-gum hat.
[UK]‘Taffrail’ Pincher Martin 223: Its beer wot’s done it, Tubby.
[UK]‘Sapper’ Jim Maitland (1953) 32: Nevertheless, Tubby, old man.
[US]T. Minehan Boy and Girl Tramps of America (1976) 15: Tubby for God’s sake take a bath.
[US]W.R. Burnett Little Men, Big World 126: Look, Tubby. I got clipped.
[US]G. Cuomo Among Thieves 472: Jo Ann [...] good old tubby-tub that she was, would listen to him.
[US]B. Gutcheon New Girls (1982) 142: No one wants to cuddle with a tubby!
Beano Comic Library No. 145 18: You and um who else, Tubby?
[US]D. Woodrell Muscle for the Wing 11: ‘Man,’ said the shamefaced tubby [...] ‘man, it’s a corset.’.
[US]S. Morgan Homeboy 118: ‘Hey, Tubby!’ called a sharp voice through the sliding glass doors.
[UK]K. Sampson Powder 87: They passed two tubbies in grotesque tie-dyed silk.