When one ventures into the outside world late at night (between 3am and 6am looking for more booze/sex/drugs in particular), and decides to wear as many inappropriate and brightly coloured clothes as possible simultaneously, they are said to be a colour popen. Reasons for dressing like a colour popen can vary from sheer idiocy, undesiarable weather conditions and/or being highly intoxicated.
"Jesus Christ almighty, and Moses and Joseph and all the saints above! Jenny and Jemima ye look like fuckin' colour popens the pair of ye!"
by Teacherdee October 01, 2006