The TRUE definition of "spinner" is:
A chick who is hot enough to bang, but ONLY from behind. In other words, you gotta "spinner" (spin-her) so as not to see her face while doin the deed.
Also referred to as a butterface
Guy 1: Did you take anyone home with you from the party last night.
Guy 2: Yea, you remember that chick Jamie?
Guy 1: Oh yea, the spinner! Man, she had a rockin body, but definitely a butterface.
Guy 2: Yep. Definitely a spinner.