A bitch with purpose is someone who bitches about someone in the hopes that they hear about it and change their ways.
Jessica : OMG!! Look at what she's wearing. Nah hun (Gina) that aint right for school.

*Rumours spread around school that Jessica said this about Gina

Gina: oh i guess she was saying it for my best interest because Sasha got told off for wearing the same thing as me yesterday. Thank god Jessica is a bitch with purpose.
by Assholewrecker6969 October 25, 2017
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someone who can't say two words without talking shit. They go out of their way to be a raging bitch. In a group of friends, "she" would be known as the "bitchy one". Constantly putting others down for entertainment purposes or to make "herself" look better.
"Damn, she's a bitch on purpose for talking all that shit for not reason!"
by Sierra February 23, 2005
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