The act of ejaculating all over a friend or roommate's bed when they are out with the key being not telling them when you have committed the act till a much later date.
Can be used as a very credible threat.
"My brother didn't want to let me use his PS3 so I gave him some sneaky sleepers"
As a threat,
"Pay your half of this month's rent or i'll leave you some sneaky sleepers"
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somebody who's drunk, and see's her dormate doing something sneaky, and deny's it.
That ALEX such a sneaky sleeper!!!
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