Top Definition
1: used especially for when you beat someone in an argument, or if you are a bystander and is speechless about what to say.

2:slang for "that sucks" or "haha you suck."
guy one "dude i wasnt texting your girl last night" guy two "well she said you were and you were trying to convince her to leave me" guy one "nahh man" guy two (takes out his girlfriends phone) "hmm this looks like your number" (shows text)
guy two "uh....."
bystander "NuNu (NŭNŭ) !!!!!!"
by bz24 April 04, 2011

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