12 o'cock Share definition Flag The state of penis when it is facing north, 0 degrees, or 12 o'clock, usually tucked into the waistband. "...and when she looked away I adjusted to 12 o'cock." 12 o'cock by middlenameskip June 26, 2012 0 0 Get merch Get the 12 o'cock mug. Buy Now — $32.95 See more merch