Teen Stomach is a condition most commonly associated with teenagers, the primary sympton being a munchies-like desire to consume food. However, this is different from munchies in a few ways, the most notable being that one never needs to be high to feel it. Also noted is that one who "suffers" will not eat just anything, but things that are readily available and of higher preference. The last difference is that they will eat even if full or just not hungry. This not to be confused with eating out of boredom or just being very hungry. The reason it is called "teen" stomach is that the affliction could be caused by a sudden unexplainable increase in the metabolism of an individual, hightening it to the level of a teenager.
"Dude, you ate ALL the snacks? You're gonna have to work out for a fucking month!"
"Nah, man, it was Teen Stomach, I'll be fine."
"You better be sure. Being wrong will cost ya."
"Trust me, it fits."