(stative, US, vulgar, usually used in the negative) To have the most basic level of intelligence or common sense.
30 October 1973, George Carlin, "Filthy Words", WBAI Radio, quoted in [https://digital.library.unt.edu/ark:/67531/metadc306637/m1/127/?q=Shinola FCC Reports, Second Series, Volume 56, October 31, 1975 to January 16, 1976, page 101]:
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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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