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1.
A term coined by Fred Bliss, a slan term for penis. The original word was used in context one day at Chandler's Tavern, a restaurant at the Yankee Candle Company.

The term was invented in the summer of 2000.
Actual excerpt from the conversation where it all started:

Larry said: "She was so pissed off!"
Fred said: "He's lucky she didn't kick him right in the beef whistle!"
by Fred October 25, 2004
 
2.
penis.
I first heard my friend Grumpy say this one night in 1994 while a particularly skanky newswoman was reading the TV news in Lexington Kentucky.
Grumpy said "I bet she knows her way around a beef whistle".
by joe anyeaho February 28, 2006
 
3.
Used to describe ones asshole particularly one emitting gas.
It's beef whistle time! Toot! Toot!
by the noah June 09, 2005