An onomatopoeical adjective based on the sound emitted when something
is "oh so tasty" (either through hunger or flavorological value) that
one gnaws through it without regard to cleanliness
or etiquette. This sort
of ravenous eating will often result
in an "om nom nom nom" noise being emitted from the eater.
Arthur: Gosh, I haven't eaten for days.
Dirk: Me neither. We're both
Arthur: Look! A whole cooked chicken with side of mashed potatoes and a warm/soft dinner
Dirk: We have to decide which of us gets to eat first. To be fair, we should rock-paper-scissors for it.
Arthur: Om nom nom nom nom!
Dirk: Arthur, you're a jerk. A real knee-biter.