A time in the day where the music Demi-God Sparkles* of Area 11 deemed it appropriate to deploy a song by Area 11. This tradition can be carried on by anyone as long as the guidelines are maintained.
Overprotective Father: Let me remind you that it's MY daughter you're dating. You'd better have her back home by 11:00, or so help me, you WILL marry her!
Usually after noon (aka 23:15). Time of the day when the shitposting is supreme. When one realizes that it is 11:15 (or nearing that time), one must immediately proceed to shitpost (or prepare a shitpost for the given time).