verb: Choking one's sex partner during intercourse so that the person's head turns purple and the individual has an orgasm, during which, the person, as a result of the choking, fucking, and climaxing, involuntarily makes the sound "giggedy."
Man, the chick can't come unless she gets choked, kinda freaky, but hey, I obliged, well she's grabbin my hands and pushin them together, her whole head is turnign purple and I'm getting a little concerned, but all of a sudden she comes really hard and says, fucking "giggedy." No shit man, I fucking, Grape-head Giggedy-Fucked her.
A version of a person called Grace, a version in which Grace goes mad. Basically, Grace has seshed to hard at this point and she has become what one would call, uncontrollable. She has been seshing on the voddie for too long and needs to be stopped. Sesh Head Grace is too powerful.