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Is "bitch" in "Bitch please" expression a verb or a noun?
Is it calling the listener a bitch as in "bitch, please" or is it some kind of provocation as in "bitch (more) please (I don't really care)"?
It's a noun, calling the listener a "bitch". And as noted in a comment, a comma should be inserted. In speech there are two intonation groups which justifies the use of a comma.
I hope it is clear that it would be very insulting to use it in most contexts.