B.O.A.T.S.
Means the story is mostly lies, but there might be a tiny bit of truth. People use it like a cheap gift when they don't want to admit they're full of it.
"I saw the president eat a sandwich, B. O. A. T. S.!", said by someone who probably ate the sandwich too.
"The dog is a wizard, B. O. A. T. S.!", said by someone who might be a wizard too.
"The principal has a secret life as a rapper, B. O. A. T. S.!", said by someone who probably raps in the bathroom.