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1.
A term used to describe the person you hate most in the world. I.e. If you only had 1 bullet to kill one person in the world.
Boy : Man I hate that fat cunt. He is definitly my 1 Bullet
by Colm.. December 27, 2008
 
2.
Shooting one bullet out of your desert eagle, and killing the player with a headshot in Counter-Strike.
Nick "Blitz" Rochon 1bulleted three guys at de_dust2 in the same round he is "leet"
by Adam Paterson January 13, 2005