A McDonkaDonk is a person who has a large butt due to eating excessiveMcDonalds. ; A person who was not born with a large butt, but grew one due to eating excessive McDonalds.
"I was trying on my jeans the other day and my McDonkaDonk would not fit in them so now they do not fit!"
The masculine equivalent of the term Badonkadonk. A man with an exceptional package. As where a badonkadonk sticks out in the back, a mendonkadonk sticks out in the front.