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The legendary goop from which all McDonald's menu items are derived. Chilled and pooped out of machine into a cup, it's a shake. Baked in an oven, it's a bun. Grilled, it's a burger. Molded different ways and fried, it's french fries, chicken nuggets, onion rings, etc.

Generally anything that comes from a McDonald's restaurant.

Also anything that's cheap, abundant, undesirable and valueless.
The McStuff... it is... ALIVE!
McStuff by evildave August 26, 2010

Sausage Egg McStuffin 

Also see happy meal.

Whilst receiving deep-throat fellatio from a woman, one may stuff one's ballsack into the woman's mouth at the same time, the sheer volume of which causes her lips and cheeks to stretch wide open (as though she's making a big happy smile, hence it is sometimes referred to as a happy meal.)
Man, look at the mouf on that chick... I'll bet she'd love a nice Sausage Egg McStuffin for breakfast.
Sausage Egg McStuffin by al-stud December 26, 2009

cap mcstuffins 

when you are capping so hard cap is not enough
Girl: “You’re the only guy I talk to”
*Sees her snapscore is 2 million*
Boy: “Yeah that’s cap mcstuffins”

egg mcstuffins 

When you keep jamming shit into an object and it reaches max capacity.
Yo you see that trash barrel that thing is egg mcstuffins.
egg mcstuffins by Cuck Fin July 15, 2016

Mcstuffed 

Where you know you aren't full because you didn't eat to your capacity, but you ate McDonald's, so you feel absolutely horrible and sick to your stomach.
Today i had the urge for something light that could hold me over for a few hours, so i went to McDonald's and bought a burger off the dollar menu. After eating this i was so Mcstuffed i couldn't even have dinner...
Mcstuffed by v-tech June 16, 2009

Mcstiffy 

When ya have a hard on in the maccies drive through
"shit this maccies breakfast is giving me a mcstiffy
Mcstiffy by Liz bones October 16, 2018