Northern English slang.
To punch or hit someone / to receive a hit or punch from someone.
"I was up gym, some lad though he was all that, started getting mouthy, even tried to give me some fist, so I sparked him right in his gob"
To ask for a fist bump (In a cool manner) ((Usually used between friends or close colleagues))
Parker: Yo Caelan fire me some fist
Caelan: *Gives Parker a sick fist bump*