fuckoff o'clock Share definition Flag The time at which a person has totally outstayed their welcome, and is asked to leave. "Steve, it's fuckoff o'clock mate. Time for you to go." fuckoff o'clock by Kez 4 Prez August 16, 2014 0 0 Get merch Get the fuckoff o'clock mug. Buy Now — $32.95 See more merch