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The Collaborative International Dictionary of English v.0.48 (gcide)

frag \frag\ (fr[a^]g), v. t. [imp. & p. p. {fragged} (fr[a^]gd);
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]

Note: 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]