Top definition
A penis that appears small but grows large when erect. The term sleeper is in reference to a car that appears to be stock and slow looking, but has a powerful engine under the hood
You should totally hook up with him, I heard hes packing.

My friend is in water polo with him and he sees him in the locker room all the time, he said its tiny.

Hes never seen him hard, hes got a sleeper dick.
by PopeyeTheSailorPop21 November 05, 2018
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May 28 Word of the Day
A goth who has been part of the subculture since it originally came about, or a goth over the age of 40.
by Solinium May 30, 2008
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2
A drawing of a penis in another persons school book that is drawn far through the book so that it is designed to be found and cause shock weeks or months after it is drawn, much like a sleeper agent.
Harry discovered the sleeper dick in his physics workbook, three months after we drew it.
by The Magi Carpy May 15, 2015
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