Parafuso solto causando barulho no carro

What does “coisa rápida” mean in Portuguese?

In Brazilian Portuguese, coisa (“thing”) is the all-purpose filler noun, and pairing it with an adjective is how people shrug a job off as nothing. Coisa rápida means “a quick thing,” coisa simples “a simple thing” — what a customer says to insist the work is trivial. It is everyday spoken register, not a fixed idiom, which is exactly why it is so reusable.

The pattern is coisa + adjective: coisa fácil (“easy thing”), coisa boba (“a silly little thing”), coisa de cinco minutos (“a five-minute thing”). It belongs to the same downplaying family as não é coisa de outro mundo (“it’s nothing out of this world”) and por coisa pouca (“over something trivial”). Here the mechanic finds the noise is just one loose screw, tightens it, and repeats the customer’s words back — “Coisa rápida, coisa simples” — half agreeing, half teasing, the way “no big deal” lands in English once the job turns out to be exactly that.