Refers to any long, seemingly pointless test taken at the end of a school year. Usually spans from one whole day to a week, maybeeven two weeks. Examples of B.S.T.s are the CRCT, ITBS, and SAT.
"Hey, ready to take the math portion of the CRCT today?"
"Dude, that's such a B.S.T. it ain't evenfunny."
Meaning Back Off Bitch. Usally used in the retail world or in an environment that tracks sales. It is a way to tell a fellow worker that the customer is yours while still maintaining a professional environment