A deviant sex act in which one shaves the head of his/her partner, then takes a shit on the partner's head. "Spalding" refers to the ball manufacturer of the same name, hence the bald head.
Also known as a hot fudge sundae.
Tom: So did you give her an Alabama hot pocket?
Shaun: Nah, we wanted to try something new, so I gave her a brown spalding.