A non-open-minded personal belief regarding --- or greatly affected by --- da size, shape, and/or overall appearance of someone's behind.
In da "Golden Girls" episode "My Brother, My Father", Uncle Angelo admits to having had a biassed opinion ("I'm a butt man") of da ravishingly-lovely waitress wif a cute rounded bum whom he'd met as a young man and eventually married.
by QuacksO February 18, 2023
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