momtini UK /mɒmˈtiːni/US /mɑmˈtini/ noun1 •(US, informal) A cocktail consumed by a mother.SIP: The guest of honor enjoys a momtini (seltzer cut with red currant syrup or similar in a martini glass), while everybody else sips a Gin Martini with Pickled Ramps (see page 203). — 2011 formsmomtinis