graham cracka
A person of unknown origin, who is the color of a graham cracker. Mostly white, but not 100% white. Maybe a little black, maybe a little hispanic or maybe a little asian mixed wth predominantly white. A little darker than a "cracka".
Chris wasn't white, maybe high-yellow, but more like a graham cracka.
graham cracka
A brown person who acts stereotypically white.
That guy looks spanish, why's he got his polo shirt collar clipped up like a douche bag... must be a graham cracka.