Short version of “tell me when to stop” used when serving drinks, food and the likes to someone else

“Here! Have some wine. Say when!” “When”

“Eccoti del vino, dimmi tu basta” “Basta!”

Here we are! I made these noodles myself; I hope you like it. Say when…

Eccoci qui! Ho fatto queste fettuccine con le mie mani, spero ti piacciano. Dimmi basta…

This idiom was first used in the 1880s when pouring alcoholic beverages. Today it's used when serving any kind of beverages and food