os3s Share definition Flag oh shit, 3 seconds. When you lose the bet and you sniff the bad smell of one's foot for 3 seconds as a punishment, then you will say: os3s! (oh shit, 3 seconds!) os3s by linyouyao December 16, 2008 0 0 Get merch Get the os3s mug. Buy Now — $32.95 See more merch