Slide your fist into someone's asshole and spread all your fingers out all at once.

Much like the regular hand grenade, but instead of using a vagina, you are using an ass hole.
"Did you hand grenade that chick last night?"
"No, but I did do a reverse hand grenade!"
by muffinhasmypants April 19, 2009
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what monkeys in the zoo use for ammunition, often humans will toss one into the fan
He pissed me off so bad I'm gonna hit him with a Boise Hand Grenade!
by jay's idea March 08, 2007
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Molotov Cocktail or other Improvised Explosive Device (IED)often used by Irish Nationalists like the Irish Republican Army (IRA).
An Irish Hand Grenade is typically made of inexpensive and available materials, such as glass bottle that breaks upon impact allowing flamable liquids inside to ignite from burning rag sticking out of end of bottle.
by MacanUltaigh January 17, 2009
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When your female room-mate throws a period blood soaked feminine hygiene pad into your room.
I pissed my room mate off during her period so she threw a portuguese hand grenade on my bed
by dickerie July 24, 2013
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The greatest fucking band to come out of Flint Michigan. Mostly a classic rock party band but they also do quite a bit of alternative music. They mostly do Clapton, Lynyrd Skynyrd, and other great 70's stuff.
Dude, Jake, the guitarist from Horseshoes & Hand Grenades, Justin the drummer, and Nolan the bassist make a kick-ass team!
by flintguy August 27, 2010
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While consamating with a women u bust or jizz in your hand and scream "FIRE IN THE HOLE" and then throw the handfull of jizz which looks like a grenade into her face therefore EXPLODING into her eyes
"Dude i nailed Tracy in the face with an Irish Hand Grenade last night"
by Matt Friedman July 30, 2006
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