Phrase stating that you should void what happened and it should not mean much. The band bus is merely a reference back to a bus driving home on a dark night. So making out with that girl next to you was not a big deal.
Guy: i cant believe Sarah lol
Girl: whattt?
Guy: makin out with robbie
Guy: and me
Guy: a week after me
Guy: in time
Guy: but hey
Girl: told you!!
Guy: but hey, it was onthe band bus
Girl: yeah the band bus of crazy horny maniacs lol
When a woman hikes up her dress and proceeds to squat over the face of a partner. The partner then in turn vomits up into her sweaty asshole. The vomit is then deflected back into the face of the partner.
To have some sort of sexual interraction with a member of the opposite sex (or indeed same sex, depending on your orientation), but not go the whole mile and have actual intercourse.