Green’s Dictionary of Slang

1. (US, also dyno) a tramp, a layabout, esp. an old one [dingbat n.⁷ (2)].

1918		‘A-No. 1’ Mother of the Hoboes 44: The Rating Of The Tramps 40. Dino or Dynamiter. Sponged food of fellow hobos.
1925		G.H. Mullin Adventures of a Scholar Tramp 46: The stew-bums or old dynos of the barrel-house saloons.
1927		C. Samolar ‘Argot of the Vagabond’ in AS II:9 386: Dino is a synonym for dingbat.
1933		Ersine Und. and Prison Sl. 32: dinah, dino, dyno. [...] 2. An old man who can do nothing but puddle around.
1936		Mencken Amer. Lang. (4th edn) 582: A beggar is a panhandler and an old one is a dino.
1949		N. Algren Man with the Golden Arm 20: Some day he’ll shake down the wrong dino.

2. (US) an Italian or Hispanic labourer [the ‘typical’ Mediterranean name, Dino].

1918		H. Simon ‘Prison Dict.’ in AS VIII:3 (1933) 26/2: DINO (pronounced dee-no) Wop or Spic (Mexican) section-hand.
1942		N. Algren Never Come Morning (1988) 48: You was some dino from across couldn’t talk English even.