An onomatopoeical adjective based on the sound emitted when something is "oh so tasty" (either through hunger or flavorological value) that one gnaws through it without regard to cleanliness or etiquette. This sort of ravenous eating will often result in an "om nom nom nom" noise being emitted from the eater.
Arthur: Gosh, I haven't eaten for days.
Dirk: Me neither. We're both starving equally.
Arthur: Look! A whole cooked chicken with side of mashed potatoes and a warm/soft dinner roll!
Dirk: We have to decide which of us gets to eat first. To be fair, we should rock-paper-scissors for it.
Arthur: Om nom nom nom nom!
Dirk: Arthur, you're a jerk. A real knee-biter.
by Tom and Jana December 19, 2004
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The sound of ravenous eating. Popularized by the character Cookie Monster on Sesame street, it is now used commonly in speech, especially among younger people. Cookie Monster exclaims "OM NOM NOM NOM" when gobbling down cookies (and whatever else goes in his mouth).

You can "om nom" on things besides food... for example, play-eating babies' toes to make them laugh.

omnomnomnom (dot) com is a pop culture website where people submit their own silly photos that have been manipulated in Paint to resemble monsters eating various things, including people and pets.
Cookie Monster: "COOOKIES!!!!!! OM NOM NOM NOM" (Eats everything, including plate)
by Hollis X April 10, 2008
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The act of eating in a vigorous manner
As soon as Eric got his food he om nom-ed it so fast
by mri20one December 24, 2007
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Exclaimed by various users on the website ProTrade when a delicious new floor shortable stock appears.
CW: Hey, Phil Hughes isn't on the Yankees 40 man roster and tomorrow is September 1st.

by College Wolf September 1, 2008
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the sound one makes when eating and wants to make everyone around them annoyed and desires to be obnoxious.
Mom: bob! eat your peas!
Bob: fine (eats a forkfull of peas)
Bob: om nom om nom
Mom: (gives bob the evil eye) bob!
Mom: Bob!
Bob: om nom om nom
Mom: one!
Bob: om nom om nom
Mom: two!
Bob: om nom om nom
Mom: three!!!!
Bob: om nom o-
(mom drags bob out by the ear and throws him in the trash)
(two seconds later the garbage truck goes by and takes bob)
by 500kit500 March 9, 2017
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The adorable little green monster that loves to eat peppermint candy from the Cut The Rope saga.
Kayleigh: Hey Wanda, do you play cut the rope?
Wanda: No, what is it?
Kayleigh: A cool game. The game’s fun, but see cute this little monster! His name is Om Nom!
Wanda: Awww! He’s adorable!

These are random people I made up btw just saying.
by The Amazing Spider-Man April 20, 2020
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