it was just a regular straight spin, but i got a 1260 around. i had a video on my old phone but that is now dead and gone. you have to throw a 10, which is hard enough, by flicking the left stick all the way to the opposite side you are spinning, then back to the way you are spinning super fast right as you leave the lip. then you use the right stick to like wind you guy up in the air while he is spinning. right as he comes around for 1080 you flick the right stick around and basically shifty out the last 180. i dont think its possible to do with a grab and i have only ever done it on a quarter pipe. but i have done it twice.
the game said "frontside 1260" at the bottom of the screen and everything. it was insane and it took at least a hundred tries.