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"
by xovut April 07, 2009
somebody who's drunk, and see's her dormate doing something sneaky, and deny's it.
That ALEX such a sneaky sleeper!!!
by skyler shagwell April 11, 2007

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