It must come from the mexican actor. I've checked the official on-line Spanish dictionary, and all words sounding like that (cantinflear, cantinflada,...) derive from Mario Moreno's stage name, Cantinflas. So, there's not a previous meaning for that word. The cultural impact of Cantinflas in Spanish-speaking countries between 1940 and 1980 was huge.
Just tried today. This is an excellent cocktail. I don't have Meletti, so I combined Averna, Lucano, and Ramazotti. I also combined Cointreau and CuraƧao. It mostly tastes like a mezcal and tequila Manhattan, with those spirits being the most prominent flavours.