For Blogball

For Spanish-speakers, the word for "touch" (tocar) is the same word as "play" as in "play a song" or "play the guitar".

Also, the word vieja can mean "old" or "old lady" (in both of the senses we use it: older lady, or "my old lady").

So if you tell the mariachi to "Tocame una vieja", you could be saying "Play me an oldie" or you could be saying "Touch an [old lady]" (Snicker, snicker)...