Could also be someone who is not the same when you're not there like a back stabber being ''funny'' doesn't always mean humor could also mean wierd
This nigga sean might be undercover funny because he acts different doesnt believe in the same things when he is not in around certain people.
A bed fart that stays under the duvet and goes unnoticed.
Anna: I'm going to get a glass of wa... Eww!
Jack: shouldn't have moved! I planted an undercover agent
when a girl farts when your in a car, house.....ect. and all you smell is a funk in the air and the source is unknown.....but guess what thats your girl ninjaing one out
i was laying in bed one night and all i smelt was a strange odor i looked over at niki and asked about her undercover fart....she laughed and admitted to it
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n. a long, submarine shaped turd that is crapped out before, during, or immediately after sex....beneath the bed sheet covers.
The undercover sub slinks, slithers, and slides across the sheets until it comes into contact with one's sexual partner...causing a multitude of reactions which may include, but are not limited to: excitement, anger, fear, frustration, confusion, bewilderment, angst, mild and/or severe depression.
Last night after I did it with Janie, I swear I heard her shart. No sooner had I smelled the crap, then an undercover sub appeared out of nowhere...spreading across my leg like a wet, stinky rash. It ruined the new bed sheets!
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A person who is half or a quarter chinese, and doesn't look Chinese.
Henrietta: Ayo, is this kid white, 'cause his eyes is weird.
Joe: Nah dawg, he's one of dem undercover chinese. He's mom's probably chinese, but all you can see is his slanted eyes, revealing his inner-chinaman.
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Undercover Bagel, or "UCB" for short, is a term used for a jewish person with a non-jewish sounding name.
Not to be confused with "Pizza Bagel" - a person that is both jewish and italian.
Did you see the size of John Smith's nose?
He's an undercover bagel.
Oh, that explains it.
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A girl who looks sweet, but really just a hoe who wants your dick.
"I think Katie wants me bro."
"Nah, she's an undercover hoe, back out while you can."
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