More on Tile Loose from Infoplease:

• Tile Loose - Tile Loose He has a tile loose. He is not quite compos mentis; he is not all there. Source: ...
• Slate - Slate He has a slate or tile loose. He is a little cracked; his head or roof is not quite sound. ...
• Loose - Loose Having a tile loose. Not quite of sound mind. The head being the roof of the temple called ...
• Dictionary of Phrase and Fable: T - Definitions, origins, and illustrative excerpts for words, phases, and literary allusions starting with "T"