oh shiz Share definition Flag Same as 'oh shit' used for teenagers who do not like to curse in front of the parentals or elders. person number 1: "We have a math test today."persson number 2: "Really?! Oh shiz, I didn't study!" oh shiz by 143_143:) May 23, 2009 0 0 Get merch Get the oh shiz mug. Buy Now — $32.95 See more merch