The level of disparity in hottness of a girl between two time periods based on natural selection.
The natural selection theory is based on the hypothesis that hott girls with be chosen by dudes more often, and will not work as hard to maintain their looks, becoming ugly. Reversely, an ugly girl will work hard to get laid and become hott.
High Bitchisity + Hott = Bad; Low Bitchisity + Hott = Good
High Bitchisity + Ugly = Good; Low Bitchisity + Ugly = Bad
"Man, that bitch is hott... but she's got a high bitchisity, so fuck that (for about a year, then bail)."
"My wife is hott! and has low bitchisity, so I'm assuming our sex life will stay pretty active."
"Eh, that ugly chick has got potential for a high bitchisity, ill just get wasted first..."
"Uhh, I'm so ugly, and my bitchisity is so low.... i wonder if they make solar powered vibrators."
When a group of women in the room reaches a certain level of bitchicity as to warrant a male to throw a box of tampons in the middle of them yelling" Fire in the hole”
The measure and/or condition of one's bitchiness. Used to describe a bitch. Commonly includes quantitative values between 1 (the least amount of bitchiness) to 10 (the highest amount of bitchiness). In some severe cases a bitch may reach a bitchitivity level of 11, in which case a pimp hand should be used on said bitch.
Pajama casual is a term used when working from home and preparing for a video conference. All business above the waist and your pajama pants down below.