Chez is short for bitches or "bit"-"chez". This refers to attractive females that males target for sexual activities. Types of females not included in this category are the feared wild gruffalo, swamp donkies and duckbill platypus.
This party is going to be great, do you know how many chez are going to be there?
Chez was originally a mispelling of the word cheese, that became a popular use over the internet. It still means cheese though. (pronounce it quickly and as if you were saying "chairs" with out the "r").