Green’s Dictionary of Slang

schloomp n.

also schlump
[Ger. Schlumpe, a slovenly woman]

(US) a stupid person; also as adj.

[US]J.G. Rothenberg ‘Peanuts! The Pickle Dealers’ in AS XVI:3 Oct. 190: Drip, Droop, Schloomp. A stupid, mopy person.
[US]L. Sanders Pleasures of Helen 138: ‘I am just a poor, uneducated Ohio schlumph, and I cannot rightly understand’.
[US]L. Shecter On the Pad 78: I got the best equipment [...] and I’m the biggest schlump. So I says to myself, I’m going to learn this sport.
[US]R.D. Pharr Giveadamn Brown (1997) 23: Them shlumps might just listen to me whooping and hollering.
[US]C. Hiaasen Skin Tight 95: Some schlump civil servant knocking down twenty-eight thousand a year.
[UK]Indep. on Sun. Rev. 3 Oct. 38: Always wondered why I lived like such a schlump.
[US]N. Green Shooting Dr. Jack (2002) 82: An out-of-shape, balding, middle-aged schlump.
[US]Mad mag. Feb. 4: I am leaning towards [the name] ‘Schlump’.
[UK]J.J. Connolly Viva La Madness 12: All the decent bartenders and waiters were hunting for sugar mamas [...] leaving me with the schlumps.
[UK]J. Meades Empty Wigs (t/s) 966: ‘Our people died in their millions and this schlump...’.

In derivatives

schlumpery (n.)

foolishness.

[US]L. Kramer Faggots 27: He had wasted the years leading up to this moment in sloth and avarice and self-pity and chocolate and rejection and schlumpery.
schlumpy (adj.)

(US) slovenly, used pos. (of clothes), casual informal.

[US]Wisconsin State Jrnl (Madison, WI) 9 Nov. 11/7: The role of ‘Schlumpy,’ the sissy, is cared for with remarkable fidelity.
[US]J. Breslin in Muncie Eve. Press (IN) 8 June 14/6: Today’s breed of boxers are [...] ‘Too schlumpy around [...] They’re all lazy-like’.
[Can]Calgary Herald (Alberta) Canadian Mag. 29 June 14/3: Where she saves is on casual clothes: she calls them ‘schlumpy’.
Austin Amer.-Statesman 18 Sept. 40/7: Walter Matthau is appropriately schlumpy as the man Miss Streisand sets her sights on.
[US]Philadelphia Inquirer (PA) 20 June 8-D/1: Dick Cavett [...] walked on the set wearing schlumpy khaki pants after discovered he had left his fancy grays in the limo.
[US]S.F. Examiner 17 May c-3/2: Dressed in schlumpy jackets and T-shirts, [Bill] Murray shambles along.
Vancouver Sun (BC) 20 June c-4/5: The man the New York Times once described as a kind of schlumpy Robin Hood.
[US]D. Winslow Border [ebook] [A] schlumpy, profusely sweating politician.