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>
Friend 2: "Yeah, tonight's been really cool."
You: "Hey, aren't spastics funny!?"
All: <silence>
by Barlos the Jackal November 25, 2003

Hand grenade pussy is pussy that looks and/or feels like someone let a hand grenade off in that bitch.
by The Infamous Tito March 9, 2010

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.
by Jameson Vandersnatch September 5, 2011

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.
by gilli-spree March 10, 2007

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."
chick#2 "really, and how was that?"
chick#1 "interestingly fun."
by Mexican with Hand grenades November 28, 2009

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
by B-Man5455 January 31, 2009

A term used in the Plastic Model Kit figure building community that refers to a kit that (usually through old age or poor design by the manufacturers) falls apart into several pieces all over the place from the slightest touch.
God the Real Grade Gundam is such a plastic hand grenade..... just by bending the knee... all the armor on the skirt and the hand fell off.
by zetavoid October 12, 2020
