He’s not gonna show you his girl because she’s hot as fuck and he wants her to himself, so you can just admire her through Maxim, where you can find, for example, Olivia Munn, who CG dated.

He could also be mentioning his Community costar Alison Brie, who has appeared in Maxim. He talks about hooking up with her in the song Sour Face.

CG is also more generally trying to get at the people who think he’s gay and therefore want him to prove that he has a girlfriend by showing them.
Suggestions
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Tyler could also be making a joke here as usually the kids that rock up to his shows are white, so you wouldn’t be seeing niggers you’d be seeing “crackers” as he calls them.
He has made similar references in other songs of his such as in Domo 23 in the line Thanks to them crackers
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Tyler could also be making a joke here, as usually the kids that rock up to his shows are mostly white — as he has pointed out in other songs of his such as in Tyler The Creator’s “Domo 23 Lyrics” stated in the line Thanks to them crackers