Bouncer (doorman)

A bouncer is a term for a person who deals with disorderly people in a bar or pub.

It has been thought that the word, bouncer, originated from when the said disorderly person would be thrown out and bounce as he hit the ground. Another speculation is that the term originated from the person that stood guard on the bar door bouncing a coin someone gave him to enter the bar on some wood to test whether it was real or counterfeit.