What is You Sleep?
1.
not knowing about something popularly known
Yo you heard about that slut chichi sucking niggas up?
Nah
Damn you sleep dawg
See
2.
another way for saying your late.
(dennis)"yooo!! you heard that new weezy mixtape?"
(gary)"naw"
(dennis)"damnn, you sleep"
(gary) "huh?"
See