An expression of eating, or a sound thereof. Also could mean a sexually suggestive action upon either a male or female, one would use the lips and not so much the teeth, avoicing a chomp chomp like action
I.E. Ow, this steak is good -Nom Nom-
Man, she was Nom Noming on me last night pretty good.
National Organization for Marriage. A group of people so afraid of same-sex marriage they fail to realize the irony of their acronym, their use of the phrase "Rainbow Coalition", or the acronym for their new project, which is "2M4M".
I just watched the new NOM commercial; they can't be serious, right?