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."
by Mexican with Hand grenades November 27, 2009
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.
by freshdreads April 30, 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 04, 2011

Free Daily Email

Type your email address below to get our free Urban Word of the Day every morning!

Emails are sent from daily@urbandictionary.com. We'll never spam you.