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1.
With a genesis in the circus, "Hey Rube" is hollered when an individual wants to call for help from his entire team in an emergency.
If someone is being attacked, they would yell out "Hey Rube" and his compatriots would rush to rally to his defense.
by Ron Shulkin September 26, 2004
 
2.
When a fight breaks out between carnies and townies.
Check out that hey rube that just broke out by the ferris wheel.
by Kali Pope October 26, 2006