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

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

mexican hand grenade 

when one craps in their hand and throws it at a group of people

I could be wrong, but i think that kid is preparing to throw a mexican hand grenade at us.

mexican hand grenade by freshdreads May 1, 2010