A smash is an ancient cocktail template, going at least as far back as Jerry Thomas’ 1862 How to Mix Drinks. It is a type of julep – a concoction of spirits, sugar, and mint. Extra fruit, either in the form of juice or garnish, makes it a proper smash.
Référence: https://cocktailpartyapp.com/drinks/smash/#:~:text=A%20smash%20is%20an%20ancient,makes%20it%20a%20proper%20smash.