Used to describe someone who is sex in itself, nothing else. They are hot, and they just scream sex to everyone who see's them, male or female.
A sxc person can often drive others into insanity over them.
Person 1: Damn that bitch is hot shit!
Person 2: That's pure sex right there
Person 1: She's my sxc bitch now.
Person 2: NO WAY! She's mine! I won't let you!
Person 1: I'm so putting my keys in her car..
Person 2: That's it, I challenge you to a duel!
Person 1: At dawn. Bring it.