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1.
A much more...kinder way of saying:
BitchPlease.

Also used as a form of chatspeak on fourms by the "1337"
User1:YO MAMA
User2:BISH PLZ.
by Ren-REn October 07, 2006
 
2.
a silly way that odd teenage girls use to address other odd teenage girls, usually refering to the shallow actions of shallow girls
Girl 1: That hoochie was giving me the eye earlier, I think she's jealous that I got asked out by that hawt jock.
Girl 2: Bish plz, you're not even interested in him, she just likes the drama.
by E-R-K October 10, 2008