Stands for Sex in the Butt Crack (in other words, anal sex) Also can be used as Señor Butt Crack, but hearing that is rare. It is mostly Sex in the Butt Crack.
Zeke: Dude! You just got SBC'd by Señor Butt Crack!
Dylan: I know! Man, I hate that SBC guy, always SBCing everything he sees.
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