(synecdochically) A fool; an idiot; a contemptible person.
Luca was wary of Tav getting away with too much twattishness, because he had a lot of it floating around, and maybe some people liked that whole knobhead dominant guy thing, but not Luca.
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Regional slang from around the English-speaking world — British, Australian, Irish, Caribbean, Nigerian, Filipino, AAVE, and the hyphenated-English dialects that make the internet sound local.
See all Regional & Other slang on Slangora.