A corruption of the term "guise" which is a further corruption of the word "Guys". It has the same meaning in which the same circumstances are used, but in a different format.
Oh, 'sup guize; j00 finish teh lul catzimg yetz0rz?
The wrong way to spell guys, which is spelled like it should be pronounced like 'quiz.' Only those who have not graduatedelementary school should spell it this way.