B.T.S.B.S.
A way to mock girls who wear shirts that show off their bellies when they shouldn’t. It means Bellies That Should Be Buried.
That girl’s belly is so big it looks like she swallowed a whole pie. B. T. S. B. S. is happening.
She’s got a shirt that shows her gut like it’s a crime. B. T. S. B. S. is the only way to describe it.
Why does she think she can wear that shirt? Her belly is a whole meal. B. T. S. B. S. is the reason.