mollie UK /ˈmɒlɪ/US /ˈmɑli/ noun2 •Any of many New World fish of the genus Poecilia, formerly called Mollienesia; more commonly molly. •(informal) A Molotov cocktail.It seems the weapon of choice in Rostock and other wonderful displays of harmony with fellow humans (NOT) was the Mollie (Molotov cocktail). — 1993 formsmollies