bouncer (n.) Look up bouncer at Dictionary.com
1762, "one who bounces," agent noun from bounce (v.), which originally meant "to thump, hit." Given various specific senses in 19c., such as "boaster, bully, braggart" (1833); also "large example of its kind" (1842); "enforcer of order in a bar or saloon" (1865, American English, originally colloquial).
"The Bouncer" is merely the English "chucker out". When liberty verges on license and gaiety on wanton delirium, the Bouncer selects the gayest of the gay, and -- bounces him! ["London Daily News," July 26, 1883]