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1.
The Penis, especially one of a military man or one of a man dressed in military gear.
The soldier shot the load out of his beef bayonet.
by Fingers McHunt July 09, 2003
 
2.
A military members penis, that usually fucks savage women.
"Yo man, better fix your beef bayonet and charge that stench trench over there in the corner..."
by michael j fox December 28, 2006