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Collective name of several top entertainers who were known to pal around, and party, during the 1950s and 1960s. The recognized leader was singer/actor Frank Sinatra, and the group (Famous for its Vegas shows, done while filming Ocean's Eleven) consisted of other top talents, Dean Martin, Sammy Davis Jr., actor Peter Lawford, and Comedian Joey Bishop.
The Rat Pack helped in raising funds for JFKs election.
by Kwydjebo September 16, 2004
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1. Legendary Hollywood group of the '50s, noted for what then passed for glamorous decadence.

2. Any group prone to pally misbehavior.
by octopod July 10, 2004
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An established pack of rats that will billgerently reject an outsider who try's to join them.
Real "G's" rat pack
My boyz and I rat-pack to keep sucka azz bitchez out of our inner circle.
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Verb: To simultaneously ejaculate, vomit, sneeze, shit, piss, bleed, and weep on your sexual partner.
Carla, I'm sorry that I killed your sex drive when I Ratpacked you in Atlantic City.
by Todd Day August 02, 2011
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Someone who is less than a second class citizen, less than a degenerate. Someone who flakes on any event.
Ricky that Rat Pack bastard.
by Dan Sanders January 23, 2011
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