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The combination of "Obnoxious" and "Outrageous". When someone is being over the line, or acting out in a highly crazy manner.
A- Yo, you saw how dat nigga just robbed dat white dude for his Dr. Dre headphones in front of the cops?

B- Hell yea. Dat nigga is OBNAGEOUS!!!
by Jheri-Curl Jimmy 1500 April 16, 2011
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