Something that exhibits the qualities of 'clayness'. Unreal. Weird.
Essentially a person who's physical appearance or personality has the ability to blow your mind.
To truly understand the meaning of clay you must understand that everything is 'clay' however it must first exhibit its 'clayness' to be considered 'clay'. You must be able to realize how 'clay' something before you can call it 'clay'.
Damn that shit is clay.
Holy fuck that dude is completely clay.
Elijah Wood is clay. Especially when he was a kid.