Green’s Dictionary of Slang

humpty-dumpty n.2

[abbr. Humpty-Dumpty, the nursery-rhyme character who, despite his posturing, ‘fell off a wall’]

1. a short, squat person.

[UK]Grose Classical Dict. of the Vulgar Tongue.
[UK]Lex. Balatronicum.
[UK]Egan Grose’s Classical Dict. of the Vulgar Tongue.
[US]Bartlett Dict. Americanisms.
[UK]Hotten Dict. of Modern Sl. etc. 52: HUMPTY DUMPTY, short and thick.
[UK]Hotten Dict. of Modern Sl. etc. [as cit. 1859].
[UK]Sl. Dict.

2. a hunchback.

[UK]Sl. Dict. 198: Humpty-dumpty [...] a hunchback.

3. (US, also humpty) an outright failure, an incompetent person, esp. in sport.

[US]H.L. Wilson Professor How Could You! 266: He plays the piano with Reddick, and he’s some Humpty-Dumpty on it.
[UK]J. Curtis Gilt Kid 246: Bloody fool to have panicked. Trying to run. Made a dead tumble out of it. A regular humpty dumpty.
[US]W.R. Burnett Little Men, Big World 19: What humpty-dumpties! [...] This big hitter they got—I saw him bust one up against the fence in the far right corner and only get a single.
[US]S. Ace Stand On It (1979) 154: Man, those humpties and hayshakers all over the South just love demolition derbies.
[US](con. 1930s) Durocher & Linn Nice Guys Finish Last 45: Babe Ruth was waiting to hit [...] ‘Get out of here, you humpty-dumpty,’ he roared.