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Someone whom, despite not showing the mental and physical frailties of a ginger-haired person, shows their true colours when they forget to shave for a few days...
Hot girls chatting in a bar

"Did you speak to that guy already, he's so frickin' cute."
"Nah, I passed him on the way to the bar and noticed with the light shining on his face that he's a closet ginger"
"Ewww, disgusting. Bummer, cos he definitely looked like marriage material from over here"
by Poppa Stuey June 25, 2014