What does "frags" mean?

Solution 1:

The term "Frag" comes from the shortening of "Fragmentation grenade".

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.

The original meaning would be classified as friendly fire. But it has evolved to mean murder/kill.

A frag is roughly equivalent to "kill", with the typical main difference that the player being "fragged" can instantly respawn (play again) in most games, i.e. the "kill" is only temporary. In games it is mainly used as a kill count and score system

Sources :

etymonline.com

wikipedia

Solution 2:

Kills. Can either be a present tense verb as in "Bob frags two enemies" or a noun as in "Bob has 4 frags."

Solution 3:

Two meanings; It could mean kills or it could be in reference to frag grenades.