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Acronym for 'Never Back Down Oath.' NBDO is used when a friend plans on doing something with another person or a group and they plan on holding that promise til they accomplish the task.
Guy 1: Yo, tryin' to go to the mall later?
Guy 2: Yeah bro, NBDO.
Guy 1: Alright, i'll let you know.

Guy 1: Next year, I plan on having a Honda S2000.
Guy 2: NBDO?
Guy 1: Yeah, NBDO.
by imRJ November 05, 2014
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