The unit for measuring swag. One thousand millibitches, or one bitch, refers to the amount of swag required to coerce a hot chick into sleeping with you based solely on your swag. Hence, if you have one bitch of swag, you can get one bitch to sleep with you.
There were three girls at the bar tonight; fortunately, I have about three bitches worth of swag.
Person A: "So how much swag do you think he has?"
Person B: "I'd say about eight hundred millibitches."
Person A: "Wait, he got that hot chick's number. He must have an entire bitch's worth."