Definitions by Cupcake98

Ninja Muffin 

A type of person, who is awesome, and they are loved by their friends.

Or some kind of person who is quite insane.
See examples below:

Katie Cupcake Ninja Muffin
Elly Ninja Midget Apple
Steph Purple Cupcakes

Ninja Muffin by Cupcake98 April 14, 2011