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1.
A guy who is known to be willing to shoot people , at a price or for free, without mercy or discrimination. The word is indigenous to the london criminal underground network.
"Oi you man I got beef, its looking like imma have to holla at Larry the lengman to come and leng these clowns up".
by Ttotal February 22, 2008
 
2.
A person in possession of a firearm.
That guy right there is a lengman!
by m -P March 02, 2008