Yes-man: a person who agrees with everything that is said; especially one who endorses or supports without criticism every opinion or proposal of an associate or superior. First known use in 1912 by Freeman Tilden in Century Magazine.
In 1993, the American Economic Association published an article demonstrating how subjective performance evaluations, one of the popular methods of giving employees feedback and determining such things as pay raises, incentivized employees to become Yes Men.
The article also argued that because of the tendency to create Yes Men, these programs should be avoided. Nevertheless, subjective performance evaluations are still commonly used in American businesses. In fact, Yes Men are so common in American culture that in 2008 Warner Brothers released the British/American film Yes Man.
This film follows the life of Carl Allen, a very negative person who decides to change his life by answering “Yes!” to every opportunity, request, or invitation that presents itself to him, something which, despite a few mishaps, ultimately increases the quality of Allen’s life.