Every time something is different... in another sentence I put your hands as las manos and it was wrong , because they want me to put the hands... this time, remembering that episode, I wrote the mouth even in if my mind there was your mouth and obviously it's wrong... disappointing and frustrating...
Definite articles are often used with body parts and articles of clothing in Spanish. The definite article is used when a verb, pronoun, or context make it clear who the possessor is.
That is clearly the case for this sentence ('What do you have...') but without knowing the whole of the other sentence, it is not really possible to comment about it.
The definite article is frequently used in place of the possessive adjective for body parts.