Foreplay?

Hi

A dialogue from Light as a Feather:

O: .........We need to get to Isaac's locker, now!........It's payback time. .........Isaac's still gloating about those fetal pigs he put in my backpack last year.

A: You kids and your crazy foreplay.

What "foreplay" means in this context? I know foreplay means a sexual activity that precedes intercourse but I think here it means something like "trick". I'm not sure though. Could you please explain? Thanks in advance.