I'm going to say... doubtful. Even I'd never seen it used exactly that way, although I'd heard or seen 4 of the 6 similar-sounding variants given. Most of those are non-words with no other meaning in English -- all but 2, the other one of which has a real-word definition very close to its slang meaning. Slang is terrible to try to pin down because the spelling is completely up to the user's discretion, with no 'correct' or 'incorrect'.
But then there's the fact that the gag text itself mentions the color green (although it'd help if the actual page were in color, it's true). I'm not going to even attempt to read the writer's mind on this one, but I believe you're off the mark with that interpretation. Oh, and the BACK page is the outside back of the comic (not the "Last" page here, since it's not part of the actual comic, but a tacked-on 'credits page'). Or page 36 (it's a 36-page comic). I usually use the following progression: Cover, ifc (inside front cover), Page 1 ... Page 32, ibc (inside back cover), back cover. Here they like to count the all 4 cover pages as "Pages", but then, anything that's a separate image is a "PAGE" here: Double-page splash, index card, uploader's egoboo page (okay we love you). No insult intended, Titansfan. I can see why you like that image!
Link to the book:
EH! 4
