- (figuratively) One who is reckless, disregards orders, uses violence to solve all problems, and bravely charges headlong into the teeth of the enemy.
After John Rambo, a fictional Vietnam War veteran and protagonist of the Rambo film series. Rambo is also the name of an old farm in Vestfold county, Norway ("Rambøe" 1664, "Ramboe" 1723) - and about 65 people in Norway have Rambo as a family name. The Norse form of the name might have been *Hrafnabú. The first element is then the genitive pluralis of hrafn m 'raven', and the last element is bú n 'farm'. The name was brought to the US by Norwegian settlers.