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1.
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
by GryphElyse May 16, 2011