Green’s Dictionary of Slang

Anto n.

[negative stereotyping of the given name Anto]

(Irish) a working-class teenager.

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[Ire]P. Howard Miseducation of Ross O’Carroll-Kelly (2004) 12: You got paired off with some Anto or other – in fact, I think my one was actually called Anto.
[Ire]P. Howard Curious Incident of the Dog in the Nightdress 2: A bunch of focking Antos came to live in our gaffs.