A secretive farting contest held on boy-scout campouts. When chili is eaten for dinner, there will be one of these declared or otherwise. It is the act of building up a fart, and proceeding to somebody else's tent, unzipping their door, sticking your rear-end into the tent, and letting rip. Shortly after the gas is expelled, the door flaps are sealed so that the odor can permiate the opposition's tent.
Man! that tent war last night was so intense, that when i woke up this morning, i had to run outside for a breath of fresh air.