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1.
1. A muffin you keep in your pocket when you are leaving the place where you got the muffin.

2. A sex act where by a woman is pleasured by someone sticking their hands in her pocket.
I am glad I took this pocket muffin because I am starving.

I am glad I took part in this pocket muffin because I was board.
by Fatrazmo December 20, 2010
 
2.
A muffin that you keep in your pocket for emergency calories. Essential for garnering sweet gainz after a workout when you are in a place with no food, or food that doesn't fit your macros.
Deshawn keeps a pocket muffin in all of his jackets, which is why he possesses great swole.
by Swoledonym March 13, 2014