GNU Collaborative International Dictionary of English

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Found one definition

1.       
   frag (frăg), v. t. [imp. & p. p. fragged (frăgd); p. pr. & vb. n. fragging.] [by shortening from fragmentation grenade; ca. 1965.] (Mil.) To assault, especially to kill or wound, with a fragmentation grenade. [Slang]  This term became popularized when disaffected American troops serving in Vietnam were reported on occasion to kill unpopular commanders by the use of grenades.
   
   [PJC]