Acronym for the term "Sweet bloody backseat vagina". Used to describe slutty virgins who allow themselves to have their hymens torn to shreds by an athletic penis. Also refers to "tight lipped" walking vaginal skeet shooting ranges that squirt the crimson surprise on their unsuspecting male victims.
"(S)weet (B)loody (B)ackseat (V)agina, that bitch's pussy was tight!"
"I bet that wet spot will result in a SBBV when I'm done with her..."