"Mannacc a Maronn" is one of the most used imprecations in the south of Italy, especially in Naples. It's a synonym of "Oh, Jesus!".

Mannacc = Mannaggia in italian= damn
a=the
Maronn= Madonna in italian= Mary Virgin, god's mum
(something fells off your hands) "Mannacc 'a Maronn! what a shame!"
by peppp____ March 21, 2021
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Maronn, in neapolitan, Naple's dialect in Italy, means "beautiful".
Like "E pa maronn"/"it's so awesome"
by Mannegg December 18, 2016
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Expression of Neapolitan exclamation addressed to the Virgin Mary of Carmel. Maronn o Carmn = Oh my God!
A: Je pigghiat cinchcent eur alla schedina! (I won five hundred euros with a ticket)
B: Maronn o Carmn! (Oh my God!)
by cognigno66 November 22, 2021
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