Bitches don't know the half, like they flunk they math

from Nicki Minaj (Ft. Drake, Jeezy & Nas) – Champion Lyrics on Rap Genius

Meaning

People that are hating on Nicki don’t know even half about her life.
In Maths = 1/2
They can’t work out ½ as if they failed Math at school

a reused line from her song ‘Click Clack’

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