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Means "kicker" or "ass-kicker". Usually to describe a juiced up dyke's actions. Use it after a noun.
"That swamp donkey is a biatch nubler!" means "That fat sow of a juiced up dyke kicks the shit out of pretty sorority girls just for the spanks of it."

"Oh, she's a biatch nubler?"
by Gam February 20, 2005