The wikipedia definition of gamer fragging is not the best article in the world. In fact, I think its pretty bad. But I came across the historical use of the term from 'Nam... is it related? I don't know.
American troops killed their own commanders so often during the Vietnam War that the crime earned its own name — "fragging."Fragging - derived from the hard-to-trace weapon of choice in such attacks, the fragmentation grenade - has varying definitions, from the killing of any superior to the murder of a soldier's direct commander to avoid combat.
So, fragging in combat is a bit like being shot by Lurker and his BB Gun, or being tk-punished in CS :-)
AP - Fragging Is Rare in Iraq and Afghanistan