frag vs stop someone's clock

frag

• To kill. 

• To hit with the explosion of a fragmentation grenade. 

• To deliberately kill (one's superior officer) with a fragmentation grenade. 

• I fragged him but he fell off the ledge afterwards. 

• A successful kill in a deathmatch game. 

• A fragmentation grenade. 

stop someone's clock

• To kill someone. 

• To clean someone's clock; to make incapable of action; to thwart. 

• Used other than figuratively or idiomatically: see stop, clock.