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This term is a drunken slur of endearment commonly used when a friend is carting your drunk-ass home. Meaning "My brother from another mother."
I promise not to puke on your leather, nubba nubba, thanks for the ride.

Driver: Thanks for not puking in the car, my brother from another mother.
Drunk: no worries, sorry 'bout the hubcaps, nubba nubba.
by W. Davis January 03, 2008
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