This is the 6169th most frequent Spanish word.
andá
"Andá" is the informal command form of "andar" in Rioplatense Spanish, meaning "go" or "come on."
Here, 'andá' is used as an informal imperative in Rioplatense Spanish, directing someone to go and perform an action.
Andá a buscar a tu hermana a la escuela.
Go pick up your sister from school.
In this case, 'andá' expresses surprise or disbelief in a colloquial manner.
¡Andá, no me digas!
Go on, you don’t say!
Here, 'andá' simply indicates an invitation or permission to proceed, again using the informal imperative.