What does 'le garcon la-bas qui est-ce' mean?

The phrase 'le garcon la-bas, qui est-ce' means the young man over there, who is he? In the Word-by-Word translation, the definite article 'le' means 'the'. The noun 'garcon' means 'boy, fellow, guy, waiter, young man'. The adverb 'la' means 'there'. The adverb 'bas' means 'low'. The interrogative pronoun 'qui' means 'who'. The verb 'est' means '[he/she/it] is'. And the demonstrative pronoun 'ce' means 'this'.