fag o'clock Share definition Flag Any time of the day when any member of a group needs a cigarette break and all others must join him or her in the smoking area. LJ - Dude, what time is it? Sam - Fag o'clock? LJ - Confirmed yes yes, see you at the smoking hut. fag o'clock by Laura-Jayne October 22, 2008 0 0 Get merch Get the fag o'clock mug. Buy Now — $32.95 See more merch