A list or collection of the words or phrases of the language of one who describes everything perceivable as "gay". A vogayulary is far more succinct than a standard vocabulary, primarily because all the words that would be considered adjectives to one with a vocabulary are replaced with just a single word to one with only a vogayulary, that word being "gay".
Matt: "Did you get the video I sent you?"
Josh: "PFFF that video was so gay."
Matt: "Wow, way to use your vogayulary"