This term is often used on the basket ball court. Most basketball players say this when they see someone that can jump very high, or can dunk a basketball very easily.
Jared: bruh did u see that nigga just dunk on that white boy?
Tyrone: ya my guy he got dumb bounce
Jared: I kno man hes got bounce!
Tyrone: but he cant jump as high as you cause you got bounce!