nom is 2 of 3 words in the phrase "om nom nom" the phrase is really a sound made when eating or mimicing eating. the origen of the sound is a video game made by Valve called Team Fortess 2 (TF2). a special item in the game, a "sandvich" that is obtained by the Heavy class character. when the sandvich is eaten if resores 100% HP and the charactor has a sound entity attached that is a defined sound "om nom nom" the phrase is now used my many tenagers whom have noclue what it even means, so that would make them trolls. in video games the phrase is a symbol for eating or healing.