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1. verb To eat something, often excitedly. ("Nom" is generally deemed imitative of the sound of eager eating.) Do you have anything I can nom on? I'm starving! I can't wait to finally sit down and nom on this pizza—it looks so good!
2. nom An expression of one's excitement for something they are eating or are about to eat. In this usage, "nom" is often repeated more than once. I can't wait to finally sit down and have some of this pizza—nom nom nom.