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 catz img yetz0rz?
The term used for a cool person or a group of friends that hang out together.
Me and my guizes all went out to pick up chicks at the bar last night