Top Definition
The sound made by someone or something eating.

Most commonly found in lolcats and similar macros. It usually translate as, "I am absorbed in eating this".

The phrase may relate to the sound Cookie Monster makes on Sesame Street when eating cookies.

Also "Om nom nom".
*picture of kitten asleep in food bowl*
"OM NOM NOM"

Joe: So how's that burrito?
Jack: Om nom nom nom!
Joe: So good, then?
โดย Infamyanonymous 19 มกราคม 2008

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Describing something being eaten usually in a humourous way.
.
Someone may badly edit a picture and draw eyes mouth and teeth over it to show that the subject is being eaten. They would then write omnomnomnom on the picture.
โดย onlineamiga 21 มิถุนายน 2008

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The kittehz food.
Cat: I WANT MY OMNOMNOMNOMZ !
โดย Berrrr. 05 มีนาคม 2011

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The sound made by a voraphile when joyously devouring someone.
*Jane sneaks up on alice and...*
OM NOM NOM NOM
Jane: mmmmmm, alice was good...
โดย Chazz3233 13 มีนาคม 2009

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The sound of someone eating typically a fat or obese person trying to chew far too much at once making the om nom nom nom sound.

"Om nom nom nom" is an onomatopoeia
Bill stuffs his face with cake, as he eats the sound resembles "om nom nom nom"
โดย Nicholas Busse 08 ธันวาคม 2007

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