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a phrase made famous by musical artist dappy from N-Dubz, na na nai translates into english as - "Im a cock with a stupid hat".
"wheres my hat? i wanna be "na na nai" today when i go out.
by ChavBusters February 12, 2010
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Supreme expressionism. Can often be said randomly or when excited.

Expression of happiness or joy best when slurred in a deep voice.

Also famously used in a song by N-Dubz.

Mainly used in the depths of SW London.

Boy1: we got no chemistry test.
Boy2: yeahhhh NANANAI or NANANAAAIIIIIIIIIII (slurred - deep voice)
by Gus Grant February 20, 2008
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This is exactly the term to use when trying to describe how much of a G you are when you get discounts at whatever showroom you go to! Na Na Nai!
boon-ilo:Yoo beleev Yoo beleev Yoo a G cuz yoo went to da park wif ure frenz 'n' letta shot off into da sky

zbud-mis: I believe I'm a G because I can spell correctly. Na Na Nai!
by N-Slomz May 14, 2009
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