Green’s Dictionary of Slang

1. of people, fat; also as n.

1930		J.T. Farrell ‘Meet The Girls!’ in Short Stories (1937) 279: ‘She’s a fat-ass cousin of mine,’ Dolly answered. ‘Now I remember her, the fat bitch,’ Marie said.
1951		J.D. Salinger Catcher in the Rye (1958) 52: That fat-assed Ed Banky.
1957		‘Ed Lacy’ Lead With Your Left (1958) 7: Him and [...] those fat-assed kids who acted like a couple of fags.
1961		(con. 1945) G. Forbes Goodbye to Some (1963) 81: Giant, fat-assed, blubbery, disgusting warthogs from Cape Cod.
1966		M. Rumaker Exit 3 and Other Stories 94: Them fatass cops don’t go nowhere a car don’t go.
1971		B. Malamud Tenants (1972) 186: The boy runs back to shoo the fatass dude away.
1987		(con. 1967) E. Spencer Welcome to Vietnam (1989) 43: Those fat-assed cocksuckers that you saw so often back in the world.
1994		(con. 1980s) G. Byrne Pictures in my Head 123: Give me a cigarette, you fatass motherfucker.
2005		G. Pelecanos Drama City 108: Cause you know that fat-ass heifer do like to eat.
2011		D.R. Pollock Devil All the Time 58: [T]he conversation he’d had with the fat-ass landlord.
2012		M. Lacher On the Bro’d 230: This fat-ass was driving a Sienna with his whole family in front of us.
2013		T. Black ‘Eat Shit’ in Killing Time in Las Vegas [ebook] I had enough [aggravation] renting Pintos to fatass out-of-towners.
2022		J. Hannaham Didn’t Nobody Give a Shit 41: I ain’t seen no fat-ass white woman carrying no babies.

2. lazy, self-indulgent.

1952		W.R. Burnett Vanity Row 163: ‘[F]atassed deadheads who think it [i.e. political power] will last forever without their turning a hand’.
1961		R. Gover One Hundred Dollar Misunderstanding 125: She do her a lotta fatass book readin, oncet in awile.
1992		P. Earley Hot House 110: ‘If we can get just one staff member to take your side, we can get you out of here,’ Bowles promised, ‘but getting one of these fat-ass bastards to stick out his neck is going to be fucking difficult’.

3. of objects, large in size or quantity.

1961		R. Gover One Hundred Dollar Misunderstanding 125: She do her a lotta fatass book readin.
1973		C. Gaines Stay Hungry 217: You gon get a ticket you leave this fatass car here.
1993		Snoop Doggy Dogg ‘Gin and Juice’ 🎵 Dr. Dre came through with a gang of Tanqueray / And a fat ass J, of some bubonic chronic that made me choke.
2002		Simon & Burns ‘The Detail’ Wire ser. 1 ep. 2 [TV script] I’m gonna write my clowny-ass name on this fat-ass check for you.

4. in fig. use, comfortably off.

1968		N. Heard Howard Street 204: Her and the rest of that fat-assed crowd she hung around with.
1969		J. Crumley One to Count Cadence (1987) 335: Teaching at some fat-ass girl’s college in the North.
1982		G.V. Higgins Patriot Game (1985) 40: I save your place every day and make a whole bunch of fat-ass committee chairmen park onna street.
2000		T. Udo Vatican Bloodbath 8: We got to kick out all the priests and the fat-assed merchants here at home.