1531, from L.
fragmentum "a fragment, remnant," from root of
frangere "to break." The verb is first recorded 1818 in Keats'
"Endymion." The verb
frag is first attested 1970 in U.S. military slang, from
fragmentation grenade (1918).
"Fragging is a macabre ritual of Vietnam in which American enlisted men attempt to murder their superiors. The word comes from the nickname for hand grenades, a weapon popular with enlisted men because the evidence is destroyed with the consummation of the crime." ["Saturday Review," Jan. 8, 1972]