Generally practiced amongst Canadians and folks from upstate New York. The practice involves a line of anal sex with the engineer (head car) guiding the BST. The rear car, the caboose, is responsible for the forward thrust.
While not mandated, it is preferrable to go Human-Raccoon-Human-Raccoon-Human, so as not to engage in the deplorable act of homosexuality.
During a break on production, the film crew found a few raccoons and decided to start an RBST.
Raped beyond repair.
It comes from the SDSU slang that students tend to use when describing the last chemistry or calculus test they took. Although derived from this language, the term can be used in numerous ways!
1. After that Chem test on spectrophotometry, my gpa was RBR!
2. "Did you hear what happened to Handoper at Monster Massive?"
-'yeah, i heard he was rolling balls and now all he does is shit strait cuz he was RBR!"