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1.) An anti-personnel device that is designed to damage its target with explosive power alone.

2.) A type of fart where hopefully the Boom warns you before the Shock wave hits, usually resulting in holding one's breath and calling an O-ring repair doctor.
1.) "The perpetrator was neutralized by a concussion grenade."

2.) "Oops! Did u just hear that concussion grenade, quick plug your nose!!"
by Mater_firehawk 21 March 06, 2014