A special type of hunger that sneaks up on ones self.
You will feel fine, and not hungry and all of a sudden you struck with unquenchable hunger.
It can sometimes be painful and uncomfortable, and is cured or satisfied by simply chowing down on food.
I felt fine during most of first block, not hungry at all, but at the end I got hit with Stealth Hunger and I needed to eat.
I wasn't hungry at all on the way up. But on the way back, I got hit with Stealth Hunger and had a stomach ache.