Refers to the practice of punctuating a sentence with the word "bitch". Often used in badass action hero one-liners.
Use a bitchclamation mark to add oomph to any statement or to emphasize that you have just pwned your enemy.
Examples of the Bitchclamation Mark in use:
This is for emphasis, bitch! - TV Tropes
You're not the only one with a gun, bitch. - Avatar
Science. It works, bitches. - XKCD