The act of shoving one's grenade-resembling hand into a man or woman's orifice and then opening it with fingers flailing wildly in a mock explosion.
Kevin: Wow, being grenaded by my girlfriend last night left my ***hole gaping!

Gerald: Eek, that sounds terrible.

Kevin: Nah dude, I loved it!

Gerald: Hmm, maybe I should try some grenading...
by Gina Castell July 20, 2009

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