Tupamaro adjective 1noun 1forms 3 adjective1 •(historical) Of or pertaining to the Tupamaros, a Uruguayan urban guerrilla organization.Tupamaro activities were very significant during the year, including kidnappings, police attacks, seizure of work centers, and even threats to the legislature against passing a law. — 1991 noun1 •(historical) Any member of the Tupamaros.For example, Mitrione is shown as pay-off man and instigator behind the "death-squad" shooting of a Tupamaro on "a very beautiful beach." — 1974 formsTupamaros · more Tupamaro · most Tupamaro