ugly, but you may have had sex with them
Person 1: Ho brah that chick is beat.
Person 2: Nah brah, she's kinda undercover sexy...
by e_web January 13, 2012
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When one takes a dump onto a bed prior to engaging in sexual intercourse with one's partner on top of the soil without the partner knowing.
Henry: Dude, I'm about to get laid but I really need a shit. What shall I do?
Harry: Just be her Undercover Swedish Brother!
by yes!yes!yes! March 8, 2014
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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 9, 2012
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a guy who acts like a baller until you get to know him and you find out he's a bucket.
julie:"girl i was talkin to mike then i found out he was a bucket."
shanon:"really? he always matched with the fresh kicks. i thought he was ballin."
julie:"i did too, but then i saw his car, and when he wore the same clothes the next week, he's a bucket."
julie and shanon:"UNDERCOVER BUCKET!"
by litwiinka December 28, 2007
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A straight man who goes out and/or secretly has sex with men behind their girlfriends/wives back
My lax bro Kevis such an undercover brother, he stops by gay bars every night to hook up with dudes behind his girlfriend s back.
by lil leroy October 24, 2022
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