Definitions by Cakelillo

Sleeper cell 

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"

Sleeper cell by Cakelillo July 10, 2015