This word comes from the mix of two separate words; Gook, which is a derogatory word used to describe someone of Southeast or East Asian descent, and Poof, which is a derogatory slang which refers to a homosexual person.
(Imagine a situation where a group of people are playing a drinking game)
Man 1: Everyone who likes chicks drinks
*all men at the party apart from Jameson drink*
Man 2: Hey Jameson, why didn't you drink?
Jameson: Well, because I don't like women.
Man 3 to Man 1: I didn't know Jameson was a goof.
The term as if u telling somebody you good but you don’t fuck with the person so you say you good this bullshit ass term originated in Huntsville, Alabama