o shit Share definition Flag a phrase one uses when one is suprised by something and/or learns/realizes something new that is unexpected. Also used to express oneself during sex. o shit, what the fuck was that? o shit, i didn't know she was pregnant. o shit...oh shit...etc. o shit by m-t-a July 1, 2006 0 0 Get merch Get the o shit mug. Buy Now — $32.95 See more merch