The sound effect that is made when eating. The "OM" is the chew. Alternatively Nomnom is used to describe something tasty or nutritious.
Guy:I had a big cheesy pizza for tea yesterday

by Hebezz March 05, 2008
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An annoying noise that people make when they want food.
*Sherly opens bag of crisps*

Friend: Nomnom?
by blahbu February 28, 2011
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“i don’t have any money but i can pay you in nomnoms (; “
by nicecockbro May 04, 2020
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