Used to mean 'more, more!' Originally used to mean print more copies of useless crap while in a lesson at school, to waste time.
Teacher: Today we will learn algebra.
Because he is both an MC AND a DJ, that's where the MJ part comes from. This kid wears ludicrously short ankle-swingers, hence Ankles.
Hey MJ, your ankles must be cold, buy some ankle-warmers!
Usually used in the plural (gummis), a gummi is a small edible bribe that a teacher offers a pupil to work. Gummis are usually sweets.
Bob: Miss, I can't be bothered to work!
Miss: Oh Bob... I have gummis!
(Bob then works like mad)
Tim Smith, the one and only McGunit
Used as an insult
Dave: You smell, you stupid midget cubed!
A small bean-filled ball which you lob around classrooms for fun.
Hey MJ, chuck me the happysack! I want a piece of that pie!
Suzie's skirt was full of crusted skimo.