Conc meaning Conccusion grenade. Used in TFC ( Team Fortress Classic ) A halflife multiplayer mod.
Usually used for " Conc Jumping " Conc make somewhat of a forcefield and pushes the user in directions according where there standing
See if you can conc over that bridge.
Originated in chemistry while learning about concentrations.
1. Solid, concrete
1. Dude that shit's conc!
2. He totally just conced you.
3. -insert chem mumbo jumbo-