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To puke, vomit, throw up. Usually done when one sees something really disgusting or drinks too much.
The doctor had to extract a squirming bot fly larvae from under Hector's skin. In the middle of the procedure the doc turned away and had to whistle beef.

Jack drank a couple of six packs of swill beer Rainier Light and then went outside to whistle beef.
by Kajoe January 28, 2009
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To deficate in a mostly liquidous form with strong velocity. The result may cause butt cheek vibration, toilet bowl reverberation and an audible rumble.
"I think some passengers on the airplane heard me whistle beef becuase of the dirty looks I received when exiting the lavatory.
by Moosemunch February 03, 2010
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