A reference to one's superintendent, a high ranking official and/or the caretaker of a building.
First said by Ralph Wiggum to Superintendent Chalmers in an episode of The Simpsons, 'Lisa Gets an "A"', where Ralph confuses Chalmers' formal title with that of a popular video game system.
"I just heard that the rent is increasing for our apartment! Our Supernintendo is being a real douche, huh?"
A supermini is a stock 84cc mini (usually one of the five major dirtbike brands) with a modified cylinder of 100, 103, 105, 109, or 112cc's. These dirtbikes also have a 16" rear wheel and a 19" front wheel as opposed to the normal 14" and 17" wheels on a stock 85cc bike. These bike's ate the perfect transition bike from a mini to a full sized bike. Often, a skilled rider on a supermini can catch and pass an adult on a full sized bike.
"dude did you watch number 111 on the Yamaha supermini dirtbike?"
"ya, he was doin the 90 foot triple jump that most of big bikes won't even do!"