What is a sweet butt in relation to motorcycle club culture?

Well, honey, a sweet butt in motorcycle club culture is a term used to refer to a woman who is romantically involved with a member of the club. She's like the eye candy who hangs around the bikers, but don't be fooled, she's got her own set of rules and boundaries. Just remember, in the world of motorcycle clubs, a sweet butt is more than just a pretty face on the back of a bike.