You've lost your rabbit a** mind

what is the meaning of "You've lost your rabbit a** mind"? Does anyone know what happens when a rabbit loses its mind?

I think it means "You've lost your mind". The extra "rabbit ass" just adds a little color to the phrase. Use of "rabbit" hints at Bugs Bunny, who was screwy to begin with.

And I'm no expert but I think that what happens when a rabbit loses its mind, is the entire herd has to be destroyed to avoid the spread of Mad Rabbit Disease. Better look that one up, though.