'Who art thou' is an old English term. Modernly translated, it means 'Who are you?' It's just a different way of asking someone's identity.
"Where are you".
"Thou Art That" by Joseph Campbell has 160 pages in its paperback edition.
thou art = you are
Thou Art Lord was created in 1993.
In modern English, 'thou art my' means 'you are mine.'
. . . That Thou Art Mindful of Him was created in 1974-05.
Thou Art the Man was created in 1844-11.
This phrase is a way of calling someone foolish or silly in a poetic or old-fashioned manner. "Thou art" is an archaic way of saying "you are," and "some" is used here to emphasize the degree of foolishness.
It means you are just a horny monkey that wants to get laid
Thou Art That - book - was created on 2001-10-10.
Thou Art in Heaven was created on 2002-08-26.
"Where art thou" means "where are you." The use of the word "thou" indicates the speaker is asking someone who is on friendly, informal terms with him, or her.