"Magna tranquillo" stands for "eat peacefully". Is used commenting someone that posted a great urge or worries about something or some detail absolutely and definitely irrelevant https://www.youtube.com/w... (this video sings small ads collected from newspapers, ending with "Franco, magna pure tranquillo" as answer to an ad who tries to sell a very old wreck of a car for a huge amount of money, specifying "call at meals hours")
