Dom literally translates to "gift" or "talent". It's a concise and impactful word that carries a lot of weight in Portuguese, often referring to a special ability or natural aptitude.
In this song, Mc Kevinho uses "Dom" to refer to the woman's exceptional dancing ability, specifically her talent for rebolando (shaking her hips). He's essentially saying, "Show us what you can do with your talent!" It's an enticing word because it hints at a unique skill and invites the listener to discover what that "dom" is.
"Teu Dom" is a Brazilian funk carioca track by Mc Kevinho and Jorgin, built for the dance floor. The singer spots a girl he has liked for a long time and is finally ready to make his move, hoping tonight is the night she notices him back.
Most of the song is a call-and-response dance instruction: the bass hits hard, and the crowd is told to dance low, make a face, then rise back up and throw the move at their partner ("o vilão"). "Dom" literally means "gift" or "talent" here, so the hook "mostra o que tu sabe fazer com teu dom" is an invitation to show off your own move on the dance floor.
The repeated "dom, dom, dom" is also a rhythmic hook mimicking the beat itself, which is typical of funk carioca's playful, percussive style.