(US, colloquial, sometimes, attributive) A person who is very annoying; a pest, a nag, a jerk.
1992, Richard Preston quoting Samuel Eilenberg, The New Yorker, 2 March, [https://www.newyorker.com/magazine/1992/03/02/the-mountains-of-pi "The Mountains of Pi"]:
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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.
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