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1.
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.
Por Tom and Jana 19 de diciembre de 2004
 
2.
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)
Por Hollis X 09 de abril de 2008
 
3.
This food is omnomnomnomnomnom

Add nomnom's as it tastes better and better
Por TonioRoffo 22 de julio de 2008
 
4.
Any kind of food, chow, eats, sustenance, etc., but particulary of the delicious snack variety.

May be colloquially referred to simply as "oms".
Bob: I'm really hungry man.
Billy: Let's book it to the 7-Eleven to get some omnoms then.

Joe: These bbq kettle chips are fucking delicious.
Susie: I know, they're my fave type of oms.
Por Alexikat 08 de septiembre de 2009
 
5.
Tasty food or snacks.
I'm hungry, lets go get some om noms.
Por Luke W. Arm 29 de mayo de 2011
 
6.
Om.nom (ahm-nahm)
1. v. To enthusiastically munch.

2. n. That which you enjoy munching, or desire to munch. ex- Dude, gimme some omnoms!
1. I totally wanted to omnom some waffles this morning!
2. Dude, gimme some of your omnoms!
Por Kalvyne 24 de mayo de 2011
 
7.
verb
The act of eating in a vigorous manner
As soon as Eric got his food he om nom-ed it so fast
Por mri20one 23 de diciembre de 2007