A sleep and slide is when you perform oral sex with a sleeping woman in order to get her lubricated for penetrative sex.
I was giving my girl a sleep and slide last night when she farted right in my face.
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When a girl mounts a sleeping dude's face and rubs between her pussy and butthole.
James: Man, Nancy must have been over last night and did the sleeping slip and slide because my face looked like a chocolate glazed donut when I woke up this morning