"Mama Inés" is a know song, especially the refrain (chorus??
)
It's a tango with elements from conga (a "tango congo")
from the cuban componist Eliseo Grenet Sánchez.
"Pero Belén, Belén, Belén,
a dónde anda tú metía
que en to' Jesús María
yo te busqué y no te encontré... "
"Pero Belén Belén Belén
a donde andas tú metida (en [dónde estás] tú metida)
en to(do) Jesús María (en el barrio Jesús María)
yo te he buscado y no te he encontrado.
"
"a dónde anda tu metía (metida)" means "en donde estás tú metida".
"Where are you insert?" meaning "where are you hidden?"
"where are you hidden, y looked for you and didn't found you"
manglar it's a swamp, so I think Tomisimo's answer it's more accurate.(I don't know what's a Mangrove swamp
).
A manglar it's a tropical swamp, like the ones in New Orleans.
Hope it helps