hitler
n. countablen. a person who acts like a cruel leader or tries to control everyone. You use this name as an insult for someone who is very bossy and mean.
n. a person who displays authoritarian, tyrannical, or dictatorial behavior. Used as a derogatory metaphor to describe someone who demands absolute obedience or exerts excessive control.
My boss is a total Hitler about office rules.
The head of the committee acted like a little Hitler, refusing to listen to any suggestions from the other members.
While the comparison is often hyperbolic, calling a supervisor a Hitler typically signals a deep resentment toward their rigid and uncompromising management style.
Borrowed from German Hitler; see German Etymology for further details.
When used as a common noun, it is often preceded by 'a' or 'total' and is highly offensive in many contexts.