bitchelorette
A bachelorette who's a real bitch to guys
Jeannie led four guys on so they'd buy her drinks and dinner this week, what a bitchelorette.
Bitchelorette Party
A bachelorette party where the bachelor(ette) is acting like a total bitch, whore, skank, etc.
Man, Jane had a total bitchelorette party last night. You should be glad you didn't go.