Rebaixei means lowered in Portuguese, and aro 16 refers to a 16-inch wheel rim, a popular setup in Brazil's rebaixado car scene where drivers modify suspension for a low stance. The phrase dezesseis simply repeats sixteen for emphasis and rhythm. Short clips like this spread on soundboards and short video platforms because the chant works as a ready-made caption in audio form. It needs no explanation inside that community, and outside it the confident delivery still signals a proud car reveal or a playful flex about a modification.