I haven't seen it myself, but apparently the Season 3 opener was spammed by Gak commercials. It's an American thing: they're still allowed to interrupt children's programming for commercials, which is why you see the black screen fadeouts in the show, even on Youtube. I'm told that here, it was four Gak commercials in a row.
So yeah, the marketing guys wanted to bring Gak to our attention by use of obnoxious advertising, and the fans made it into a meme. Mission accomplished.
Oh, I guess they were commercials according to other posts... I was closing my eyes and covering my ears during those since they seemed to be showing clips from future episodes and even that's too spoilery for me... I had no idea what this Gak thing was... a BG pony during the premier I guess?
Gah, it's so confusing! Does the mean that everyone is going crazy over the Gak commercials that aired or something? that doesn't make any sense... I can understand being a fan of MLP, but if Gak is really getting this kind of hilarious hype because they had commercials airing during the season 3 premier.... @_@ I just can't process it