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Meaning belly hanging out from under a shirt.
Often seen on African and American men and, in even more upsetting cases, women. Think people of Wal-Mart.
The origin of "boep" (pronounced like "boop" but with a short "oo" as in "look") is from Afrikaans, a language related to Dutch, spoken in Southern Africa; meaning belly, like in beer belly. In South Africa, Afrikaans has been influenced by the multicultural population and thus this collision of languages provided an opportunity for a neologism, albeit under unfortunate circumstances.
Underboep is thus related to underboob, but not nearly as appealing.
See also underbelly, def.2
Check that fat fuck's underboep! Eeeeuuuwww!!
by A.C. Kermann June 11, 2018
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