noun, plural Rambos.
a fanatically militant or violently aggressive person.

after John Rambo, a Vietnam veteran in the motion picture First Blood (1982) and its sequels

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Word Origin & History

used allusively from 1985, in ref. to John Rambo, hero of David Morrell's novel "First Blood" (1972), popularized as portrayed by Sylvester Stallone in Hollywood movie version (1982), a U.S. Vietnam veteran, macho and self-sufficient, intent on vengeance. The family name is an old one in N.J. and Pennsylvania
colonies of the U.S., originally Swedish, sometimes said to represent Swed. place name Ramberget, or to be from Fr. Huguenots who took refuge in Sweden.
Online Etymology Dictionary, © 2010 Douglas Harper
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Slang Dictionary

rambo(ize) definition

  1. tv.
    to (figuratively) annihilate someone or something; to harm someone or something. (Collegiate. From the powerful film character Rambo.) : The students ramboed the cafeteria, and the cops were called.
Dictionary of American Slang and Colloquial Expressions by Richard A. Spears.Fourth Edition.
Copyright 2007. Published by McGraw-Hill Education.
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