"Submissive and Breedable".
Can be used as an adjective for a very slutty girl.
Can also be used for very feminine and girly boys.
Exemple 1: "Dude, this girl looks very fine..." "Yeh I know, I bet she is S&B, if you know what I mean~"
Exemple 2: "Dude, this boy looks very fine with that plump ass of his..." "Yeh, I bet he is S&B as fuck, would love to get his sissy ass on my crotch~..."