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1.
A midnight snack.

The word's origins stem from the words insomnia, meaning to not be able to sleep; and NOMNOMNOM, an internet meme indicating a furious and unstoppable feeding frenzy.
Dude, I can't sleep, and I'm super hungry. I must need an InsomNOMNOM!
by HungryNOMNOMNOM September 11, 2011