I just lightly tap up or down. But I always do it when they're about to attack.

The only way to do it is to sidestep as you are being attacked...unless you are holding up/down after doing Kenshi's Tele-Slam.

Maybe U mean a side step cancel? example: u, block, u

It's what it says, u cancel the first sidestep, sometimes useful...

Yah, the actuall side step only accures when you are attacked. However, as everyone knows sometimes the SS is SUPER big, putting you on the other side of your opponet. I've been trying to figure this one out. Is it random, or a property of the move; IE, attack "A" gives a large SS while attack "B" gives a small SS. Iv'e noticed the big SS accures most often on what seams like a sure, clean hit from the opponet. Almost like there is a thresh-hold between getting hit and and SSing the attack, which causes the large SS. Heh, anywho, peace and love ya'll.