A McBlumpkin is the same as a Blumpkin, except your eating a cheeseburger at the same time. So your dropping the duece, receiving fellatio, and eating a Big Mac at the same time.
Last night as McDonalds, the fry-flipper invited me in the back for a McBlumpkin.
A blumpkin recieved in the restroom of a McDonalds fast food resturant while the reciever eats a "Happy Meal."
After Sharif recieved his happy meal Jane gave him a McBlumpkin in the girls bathroom.
Getting a blowjob in a Mcdonalds while at the same time taking a shit in there bathroom stall.
dawg she was such a slut, we stopped in the Mcdonalds after the club and she gave me a mcblumpkin.
the act of a male receiving fellatio while making a bowel movement after eating a large amount of Mc Donalds.
I almost regret eating that quarter-pounder, but at least I got a McBlumpkin out of it.