a phrase only to be used for friends close ones who don't get that mad easily other than that its a cool phrase to use for mad people.
bad use:
person: (falls on flour)
you:YOU MAD OR NAH
person:punches you
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good use:
friend:(is a bit mad)
You:YOU MAD OR NAH
both of you:laugh
Combination of "nod" and "or nah," describing the act of nodding in agreement when you can't actually hear what the person said. Useful at cocktail parties and bars. Also useful when you just aren't listening to somebody like a spouse or significant other.