infantry term to open fire on someone, by order or individually

shooting at someone

killing the enemy with small arms fire
a haji seen running with AK47 light him up!

the MF started shooting at us so we lit him up
by Alpino November 7, 2009
Get the light him up mug.
in paintball, or any form of gun-based combat, it is a phrase meaning "concentrate fire on that guy", or "shoot him till he screams"
by rob October 4, 2004
Get the light him up mug.