to talk nonsense, to let one's imagination run wild
Você tá viajando na maionese, ninguém falou isso.
You're imagining things, nobody said that.
Dicionário inFormal records viajar na maionese from 2006 for nonsense and from 2007 for imagining something that does not match reality. Aulete gives maionese the figurative sense of a jumble of things, but neither source explains how the idiom formed.
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