Japanese hand grenade 

When a male sticks a fire cracker into his urethra and lights it prior to putting his penis into a females vagina, resulting in the explosion of the fire cracker in the vagina.

Dude, my dick is destroyed after I did the Japanese hand grenade on my girlfriend

Japanese hand grenade by Poner la mesa March 10, 2010

Holy Hand Grenade 

The preferred weapon of God, set to exploded after 3 seconds (not 4, nor 2, 5 is way out), and always kills the target.

We have the Holy Hand Grenade!

Holy Hand Grenade by Extreme June 19, 2004

social hand grenade 

The act of, when out with friends and having a particularly engaging conversation, coming out with a completely inane or otherwise offensive/distasteful/unfunny comment that is so heinous it kills the conversation dead.

Friend 1: "Aww man that's so funny..."
Friend 2: "Yeah, tonight's been really cool."
You: "Hey, aren't spastics funny!?"
All: <silence>

social hand grenade by Barlos the Jackal November 25, 2003

Mexican Hand Grenade 

When you take a dump into a sock and then throw the sock at a person like a grenade. Usually done after consuming lots of spicy food. Not to be confused with the Mexican Mortar.

Monty ate a lot of Taco Bell today so he decided it was an opportune time to throw a Mexican Hand Grenade at Shane.

Mexican Hand Grenade by Jameson Vandersnatch September 5, 2011

shity hand grenade

Your having sex and you really need to shit, but you dont wanna stop banging her, so u shit in ur hand and slap her in the face.

While haveing sex, Paul really needed to shit so he whiped out the shity hand grenade on the bitch.

shity hand grenade by gilli-spree March 10, 2007

Mexican Hand Grenade 

when your fisting someone, whether anal or vaginal, and open your hand like an explosion while your hand is inside them.

chick#1 "Jim gave me a Mexican Hand grenade last night."

chick#2 "really, and how was that?"

chick#1 "interestingly fun."

Mexican Hand Grenade by Mexican with Hand grenades November 28, 2009

Harlem Hand Grenade 

When someone takes fecal matter (fresh or dry) and procedes to use it as a weapon, such as a snowball.

Dude I was walking home from the bus just yesterday when this douchebag hit me in the face with a Harlem Hand Grenade

Harlem Hand Grenade by B-Man5455 January 31, 2009