How do you do the glitch where Bullwinkle is doing the sliding on the ground?

Its pretty easy if you just mess around with it, its just awkward at first. basically in mid jump, let go of the dpad and then you need to start holding select while you're still holding A from the jump, then let go of A before you land else you'll stop. Then if you want to jump while you're sliding, let go of select and quickly press A again to jump. If you want to jump right back into the slide... same as before you start holding select and then release A before you land without touching the dpad.

YOU WIN.