Yes, I got bored. Yes, this has likely already been done before. Yes, it has many flaws. But, so what? It's still friggin' adorable.
Don't ask how he's holding a burger with one hoof and no opposable thumb. They do stuff like this all the time on the show (Twilight holding a pipe a-la Sherlock Holmes springs to mind). Ponies are mysterious like that. X3
Yes, yes, I know ponies are vegetarians. This is meant to be a joke. If you're that concerned...then consider this a veggie burger. :p
Eeyup! Om nom nom
Big Macintosh & "My Little Pony Friendship Is Magic" ©Hasbro
Golden Arches logo & "Big Mac" © & ® McDonald's Corporation
Background images from MLP Wiki
Colored (mostly) using kturtle's color keys (Cutie mark and mouth interior colored from a screenshot...I had already colored those before remembering KTurtle's color keys XD)