When a group of people (usually women) get together and bash other women. Usually begins when one person makes a simple negative comment about a female who isn't present. This quickly escalates into a full out bash against the female, and will most likely lead to the bashing of more women.
Female 1: Haha, you remember when Becky blocked me on Facebook?
Female 2: Yea, what a whore.
Female 3: I heard she's a complete slut, too. She hangs out with Sarah. I hate them both.
Male 1: You've only been here 10 minutes, and you've already started a Bitch Bash.
1. A group of hot girls who wear extremely revealing clothes in front of guys, flirting constantly and driving guys crazy because they won't go out with any of them.
2. A group of girls who intentionally make it difficult to pick up one of their "friends".
3. A group of feminist bitches.
1. "Hey, Mike are you going to try to get laid again?"
"No, I heard those girls are a bitch bash."
2. "Bro, you should ask Marla out now, the dance is tomorrow!"
"I can't, she's in the middle of a bitch bash"
3. (Protesting about womens soccer) "Look at that bitch bash, don't they realize no-one gives a shit about their dried-up old vaginas!"