LOL! "Beeber" is a made-up word. So is "stuned." I'll leave the rest for Jonny to explain.
Yep :) It's one of those inside jokes floating around FR. Somebody misspelled a word and that word took on a life of its own, like "series" means "seriously", "this is hugh!" means "this is huge!" (I think) and "all your base are belong to us!" means ... uh ... I'm not really sure :)
I saw the "beeber" thread once--I tried to find it just now, but no luck. But, trust me, it was HUGH and SERIES :)