I've yelled out the Chad's Gap call before, but the closest answer I've ever gotten was way off the mark. I think someone yelled something completely random back, because it sounded something like, "use a condom". I dunno.
If I see someone with an NS sticker on their shit, I'll just ski near them and yell out "Hello!" and things go down from there.
Just because you are on NS doesn't mean you are a good park skier- I suck at park, a lot, because I ski big mountain whenever I can, and only ever go in the park when everything else sucks. I've met quite a few rad skiers with the NS shoutout, but I've met so many more just by chatting people up on the bootpacks, the lift, the liftline before the hill opens, and just checking out lines.
Gnarly skiers are always happy to tell you how the landing looks if they aren't too far away.