Somebody who frags someone. To frag means to kill a superior officer by throwing a fragmentation grenade - a tactic used to eliminatewarmongers who put lower-ranking soldiers' lives at risk by seeking confrontations, a tactic widely used in Vietnam.
*A term to refer to a type of grenade. A fragger is a grenade that kills, as opposed to a stunner (stun grenade, aka : flashbang) or a chaffer (chaff grenade).
"Throw the fragger in the manhole!"
-a soldier telling another to throw a frag grenade into the so-mentioned manhole