Green’s Dictionary of Slang

1. a glutton.

1937–84

Partridge DSUE (1984) 516/1: C.19.

2. a very fat person.

1937–84

Partridge DSUE (1984) 516/1: C.19–20.

3. (Irish) one who has no redeeming features, a street urchin; also as adj.; thus superlative guttiest.

c.1914		C. Mac Garvey Green Line and the Little Yellow Road in Mac Thomáis (1982) 158: Of guttys, there were two.
1940s–50s		‘Flann O’Brien’ ‘The Paw-Nay Injun’ in Hair of the Dogma (1989) 86: I gev myself a dose of moorphya that I got off a hop-off-me-thumb of a lascar guttie in Poart Sad.
1963		L. Daiken Out Goes She 14: Cornerboys, urchins, gutties, street-kids.
1975		J. Ryan Remembering How We Stood 136: Her speech had lost its refined ‘blas’ (for she had now substituted this with the ‘guttiest’ Dublin accent this side of Moore Street).
1991		B. Quinn Smokey Hollow 103: Name-calling is only for gutties.
1999		(con. 1900s) R. Doyle A Star Called Henry (2000) 67: They thought we were great, the gutties from Dublin.