A creature, in this case a human, who frats so hard he occasionally (always) falls asleep in whatever frat pose/location he finds himself in.
"Hey check out the sleeper"

"Oh, standard.... Lets take pictures of shit on him, like beer cans, asses, and sorority girls and put them online"
by Mr. Fletcher June 05, 2013
Someone who falls asleep fast , usually right after sex .
I brought this fine girl home last night and when I tried to go for round 2 i learned she's a sleeper !
by teehee1415 June 26, 2011
When you bring a girl home for sex and your roommate pretends to be asleep. After you and the chick really get into it, your roommate wakes up and joins in making it a threesome.
My roommate and I pulled a sleeper on this fine chick last night and wore her ass out!
by kevinjay69 July 21, 2010
In car terms, a sleeper is any car that only has performance modifications and no visual mods. AKA "All bite and no bark"

A sleeper is the complete opposite of a ricer.
(Btw, the sleeper here is the 350Z Driver)

Ricer: "LOL, look at that 350Z. It suxxx. Mah Civic is better in EVERY WAY POSSIBLE."
Z Driver: "I see you're challenging me to a race."
Ricer: "Yo, imma show yo the real power of zis Civic. We race. And I shall win. I'm serious."
Z Driver: "Don't even try. I've got more important matters to attend to--"

-a little while later-

Ricer: "Goddamn it! YOU N00B! GET BACK HERE FOOL"
Z Driver: "No u."
(Z Driver drives away doing the "lol internet")
by N00berman October 22, 2011
Antiques or jewelry items that have been stolen and hidden away. Chiefly of British usage, a sleeper is an item of antiquity, generally of known provenance, stolen and cached, sometimes for years, until it can be sold to a private buyer or exchanged.
"A sleeper is an item that has been deliberately hidden, usually because it is hot." Lovejoy, "To Sleep No More," 1987.
by eric_catchpole September 19, 2008
When you know and feel you will have to take a huge and possiblly painful shit later in the day.
"Dude, this sucks man, I've got a sleeper."
by Cascone July 31, 2008
An alcoholic drink consumed for the purposes of assisting in inducing sleep.

The opposite of eye-opener.
"As long as everyone's calling it a night, how about a sleeper?"
"You bet."
by Kroxman October 28, 2007

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