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22.
(n) a name for a person who is morbidly obese and slightly shakes the earth as he or she walks or is incredibly stupid and fat.
"Dude, I walked into that new freshmen girl the other day and I bounced back ten feet! She is such a nom nom!"
by Mouldytoast November 08, 2008
 
23.
Slang for a cat or a kitten. Based on the fact that they nom nom nom everything in sight until trained not to. This could include furniture, electronic cables, and various publications.
"Awww man. The nom nom just ate the cord to my Guitar Hero controller!"
by dkuck June 30, 2008