whats premo mean?

I think the term you are looking for is railstand. And it means to be on the side of the board, standing on the wheels. Usually for a freestyle trick.

Primo is to primo slide, which means to slide (usually on a buttery surface) on the side of your board, standing on the wheels.

you're thinking "primo" and a lot of people get annoyed by that..so try to get used to just saying "landing on the rail" or something..of if your standing on it, dont say "im in primo" you're doing a "railstand"
haha just lookin out for you dude
primo is when the board is on its side, on two wheels..like this

go here to see it

http://www.how2skate.com/pics/276196Railstand1.jpg

doesnt rodney mullen call it primo?
but yeah i got crap fo callin it that

its when the board is on its side, but the correct term is rail