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1.
More hardcore than a bitch. A girl who is bitchcore is beyond regular bitchiness. She will deliberately go out of her way to be a bitch, in fact, she takes pride in her bitchiness and will make noted efforts to be more bitchy, if possible. A girl who is bitchcore is a bitch 24/7 and actually likes to be referred to as such.
She is so bitchcore: yesterday she was bragging about stealing her best friend's boyfriend and then she kicked a puppy.

When she kicked that puppy, that was bitchcore.
by marymagdalene12345 July 17, 2009
 
2.
Something that is condsidered hardcore by the media, but is not real hardcore music.
From First to Last would be considered bitchcore.
by Mikeflag August 27, 2007