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an act of having sex and not becomming fully aware of the situation until midway through the act.


see also. sleep walking but don't relate the meanings too closely
"that bitch just strattled me in the middle of the night...i wake up, and find her bouncing up and down on my cock"

"omgz dude she sleep fucked the shit out of you"
by HatShapedHat May 03, 2005
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2
Can be more interesting than sleepwalking.
DJ Cutoff Sideburns could fuck in his sleep, he was sleepfucking man. He wasn't good at what he did, but he could do it and that's something.
by Mr. 695-Miffles-bot June 15, 2018
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3
Falling asleep while fucking. Sleepfucking somebody can be a hazardous practice since you can get gonorrhea or syphilis by the time you regain consciousness.
Billy went crazy after sleepfucking this girl and getting syphilis.
by Mr. 695-Miffles-bot June 15, 2018
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