There was 'On chuchotte' before 'que t(u) as perdu la raison' (by the way, 't'as' is the colloquial contraction of 'tu as').

'Rumour has it that you've lost your mind, so you endure it, but you keep going without a word.'

It is often useless to try to translate song lyrics. They generally make no sense, there are puns, weird phrasing, original use of words, grammar mistakes in the original lyrics and even more in the various transcriptions. For this song, I have found a version with 'pas ta trac'; it should have been 'patatrac', a variant of 'patatras'.