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A made-up phrase for girls who wear shirts that show off way too much, but their bellies look like they’ve been hit by a truck. It means Bellies That Should Be Buried.
Just saw a girl in a crop top and her belly looked like a donut. B. T. S. B. S. for sure.
She’s got a six-pack? Please. That’s a six-pack of donuts. B. T. S. B. S. all the way.
Why does she think she can wear a tube top? B. T. S. B. S. is happening right now.