Top definition
To play music with extreme intensity whereby the likelihood of causing public disruption is inevitable.

The phrase relates loosely to Master P's song "Make 'Em Say Ugh" (Na-nah na-NAH).
"I think my friend's upstairs neighbor wants to kill him after we were Bumpin' the Nah for about 2 hours at 3AM last night haha."
by BrianBrianBrianBrianBrianBrian November 12, 2009
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