nem mas, nem meio mas
Portuguese
Etymology
nem (“neither”) + mas (“but”) + nem (“nor”) + meio (“half”) + mas (“but”). Literally: "neither 'but' nor half 'but'".
Phrase
nem mas, nem meio mas!
- (idiomatic) "absolutely not!", "but me no buts", as a response and means of interrupting another person who started a phrase with mas (“but”).