The phrase references an alcoholic beverage, specifically a liqueur. It is most commonly associated with a clear, coconut-flavored spirit. Its ‘proof’ would refer to its alcohol content, a standard measure of the proportion of alcohol in the drink. For example, a 21% alcohol by volume (ABV) beverage is 42 proof.
Understanding the ‘proof’ is essential for consumers to gauge the strength of the beverage and consume it responsibly. It also plays a role in taxation and regulation of alcoholic products. Its historical context is linked to the development of standardized methods for measuring alcohol content, crucial for trade and quality control.