i actually began to address this in another post by you :)

it is actually written "guey" with an umlat over the "u" (commonly misspelled as "huey" or "uey", and colloquially written as "wey"). The term "guey" is derived from the spanish word "buey", which is actually the technical term for a castrated bull. the term originated as an insult used to question the masculinity of another man, but over time has evolved into a term of endearment (if used between good friends). depending on your geography, the term can still be offensive.

there is, however, another possible translation of his word, since no context was provided. "Uey", spelled with a "u", is a Nahuatl term denoting respect, indicating that the person with which the term is associated with is one held in high regard by the society as a whole. when used (either written or spoken), it is put before the individuals position within the society (i.e., Uey-Tlatoani ..., translated as "the great king...").

Considering GÜEY, the meaning is variable, it is a word that may mean buddy, chap , dude, bro, or anything similar. However, it is a negative word that means more than anything and in the way that I would use it...dumb ass, or something similar...