to smell a rat, to be suspicious
Estou com a pulga atrás da orelha, acho que meu sócio está me enganando.
I smell a rat, I think my business partner is cheating me.
The image comes from an annoying experience: a flea lodged behind the ear causes constant itching and unease, keeping a person alert. So estar com a pulga atrás da orelha means being suspicious and restless, feeling that something is wrong.
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