It means of being in the state of sleep or of not knowing or not being able to comprehend. Something like you not hearing me. Or I don't know what I'm talking about. Or you don't care what their talking about.
Person blah blah blah me: but I'm sleep tho, you: what does this mean me: I try to explain; but I'm sleep tho
de Millamousee 6 mai 2013