look up any word, like hipster:
 
3.
A special type of orgasm involving a Mc Donalds food dish and mass pleasure.

Ex. Combining a Mc Chicken with a double Cheeseburger = a Mcgasm in your mouth.

Steve: hey man are you OK? You've been chewing that chunk of your Big Mac for five minutes now.

Bob: *swallows* Yea I'm fine its just that big mac.... its so good it was causing multiple Mcgasms in my mouth.
by Flavur December 10, 2008
 
1.
The McGasm is an intricate and delicious specimen of American food. It includes a McDonalds double cheeseburger in-between a Krispy Kreme doughnut. You have to be in good physical health to attempt eating one.
Tony-Dude, what the hell happened to Tyler why is he so sweaty? And why is the defibulator out?

Trevor-He tried to eat a McGasm without proper training.

Tony-Holy shit, what was he thinking?
by speedway182 October 14, 2009
 
2.
When you have an orgasm because your food from Mcdonalds is just so good.
That Big Mac just made me McGasm!
by McGasmer May 04, 2011