A sleeper cell is a person who remains a dormant member of a group while belonging to another group for undisclosed reasons. Usually the sleeper cell status is kept a secret.
Those terrorists pretending to be normal students were the ultimate sleeper cells.

Why didn't you tell me you were half Asian? You're such a sleeper cell!
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this happens when you stay the night at someone's house, and the next morning while in the shower; you accidently cum on the louffa hanging from the faucet.
"she doesn't know how she got pregnant, must have been a sleeper cell"
by 1/2RICAN November 11, 2009
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A sleeper cell is a person who surprises you with some trait of attribute that was formerly unknown.
"Jake took off his shirt to reveal that he had a six pack... And that's when I knew he was a sleeper cell"

"Jenny seemed like an idiot ans then I found out she's Rhodes Scholar, that chick's a sleeper cell"
by Cakelillo June 29, 2015
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A girl or boy who was very unattractive in high school and has otherwise become unbelievably hot in college or beyond.
Oh my gosh Josh is such a sleeper cell! He was never even remotely cute in high school.. Now look at that!
by Red1920 July 24, 2014
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When a buddy is hanging with you and starts talking to a girl, then throws you under the bus to try and get some from her. He turns his back on his boys to further the chase.
Jake just went sleeper cell on me and Jethro at the bar to get after the married chick.
by bigdust13 January 13, 2010
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When a based and red-pilled gamer has to control their power level, so that the unwashed masses don't start noticing anything.
SUSAN: Hey Mark, what do you think of BLM? They really help amplify the voices within marginalised communities, don't they?

MARK (Sleeper cell): Yes, love em!
by Buck Destroyer June 4, 2021
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Someone of middle eastern or indian descent who has hidden in the states for a while as a secret terrorist.
“That nigga Nick Makki is a sleeper cell did y’all know that?”
by ballbuster24 October 23, 2023
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