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?)
by Vir_ March 27, 2022
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when someone tells u that they’ll fuck ur mom
In Dominican Republic if u tell someone this it will not end well for u
Diablo ese mamaguevo me dijo “rapa tu madre” deja que yo lo vea que lo voy a matar.
Damn that mf told me “rapa tu madre” just wait till I see him I’m gonna kill him
by heralct September 17, 2021
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