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2.
A brunette whose facial or body hair is red revealing their ginger roots.
"Did you see Michael Fassbender since he grew a beard?"

"Yep - I had no idea he was an undercover ginger"
by Keemer June 08, 2012
 
1.
One who does not show visible signs of being a ginger (ie red hair or freckles), but days of not shaving reveal red facial hair. This allows the individual the ability to hide ones gingerness from the world.
By simply shaving his red beard, Tom was able to hide his true ginger identity and go about his day as an undercover ginger.
by Rgogo September 14, 2012