"TRR TAC TAC" is a cumbia built almost entirely on a sound. The chorus, "Trr tac-tac, taqui-taqui-ta", is not a word at all: it is the rhythm itself, sung out loud so the whole dance floor can chant it back. De Parranda and Los Morales open by calling out the band, "Que suene ese saxofón, Panchito" (Let that saxophone play, Panchito), and "Esto es Los Morales y Parranda, papá" (This is Los Morales and Parranda, man). Here papá is not "dad", it is a friendly shout like "man" or "bro".
The verses are a dance lesson. "Este ritmo es fácil que te prenderá" (This rhythm is easy, it'll get you going), so come in "con tu falda cortita o tus jeans apretados" (with your short skirt or your tight jeans) and dance it "de lado" (sideways). Then the instructions get very specific: "Mueve los hombritos" (Move your little shoulders) and "mueve el ombliguito aunque esté saltoncito" (move your little belly button even if it sticks out a bit). That last one is a cheeky, affectionate joke: Spanish loves the -ito ending to make things small and cute, and this song uses it on almost every body part. It is silly, it is catchy, and it is impossible to sing without moving.