It’s Dominican slang that implies that you
fuck your own mother, that’s to mean that you’re such a dirty, nasty and disgusting
person that you’re even able to do that.
Although most of the times, when said to other
people, it’s taken as a offensive, it’s common hear Dominicans say it as an interjection.
Qué rapa tu madre tú ere,
loco! Cómo tú te vas a comer la comida mía? (What a rapa tu madre
you are, bro! How dare you to eat my
food?)