.50 caliber Browning Machine Gun. Used in M2s from the 20s til now. Very powerful, very accurate, and most certainly lehtal.
(in my best Middle Eastern accent): Holy shit! That volley of .50BMG rounds just tore up Dirk-Dirka Allah Jihad!
by dsggffd May 25, 2006
The caliber for the Barret M82A1 sniper rifle.
Easily it is the biggest, fattest, most powerful calibur for a rifle. Has enough power to serve as an AT (anti-tank) round.
"If you were to shoot a rifle, like the M82A1, chambered for .50BMG, you'd probably lose your arm after pulling the trigger. The round is just a FUCKING POWERHOUSE!!! @.@"
by Dave February 1, 2004