Primo means a few different things. A lot of skaters call popping up and standing on the skateboard's edge (see photo) Primo. This is technicaly called a Rail Stand
, but like most skateboarding tricks, most skaters don't agree on "official" names, and tricks end up being called whatever the most popular name is.
However, Primo does definately also refer to the Primo slide. This is where the skater pops into a railstand, and slides along the ground on the edge of the skateboard. This is very hard, at least for me!
The Primo got its name from Primo Desiderio, who invented the Primo Slide.
Also Known As: Rail Stand, Primo Stand, Primo Slide
Examples: "John could primo slide 6 feet."