We can have some adjectives standing after "lie".
For example, "he is lying awake on the bed" and "the dog is lying dead on the floor"
Now, "to pass out" means "to become unconscious".
So, "He passed out" means "he was unconscious".
I think my sentence is ok, if I say "he lying unconscious on the floor".
But. now, I don't want to use the adjective "unconscious". I want to use the verb "to pass out".
Is "he lying passing out on the floor" more or less equivalent to "he lying unconscious on the floor"?