Alley Oop to yourself: Hold L + Y on a fast break
Bounce ball up and dunk: Hold L + Y.
Cockback: Hold L + B
Lay Up: Hold L + X
Leaning Tomahawk: Hold L and tap A
One Handed: Hold L and tap B
One Handed Windmill: Hold L + A
Two Handed Tomahawk: Hold L and tap X
Two Handed Windmill: Hold L + Y
Various dunks: Hold L and tap Y