Refers to a type of pocket in clothing.
Siempre guardo mis llaves en la faltriquera de mi chaqueta para no perderlas.
I always keep my keys in the pocket of my jacket so I don't lose them.
Guardé mi teléfono en la faltriquera de mi chaqueta para no perderlo.
I kept my phone in the pocket of my jacket so I wouldn't lose it.