this is an ironical nickname, most commonly used to describe racist white english teacher's who think reading to kill a mockingbird gives them the n word pass. this name is to describe the teachers who share a brain cell with every one of their siblings (they would have alot of them because they are very old).
teacher: oMg gUys tHeReS a WoRD cOMinG uP BuT JUst To lEt You kNOw I wOUld NEVER sAY tHIS word IN aNy oTher conTExt!1!!111 soooooooo ANYWHOO HERE IT IS:
you and your mate at the back of the classroom: wow, what an english einstein!
When you find some manky ass billy at the side of a park hidden in some bushes made out of a texta, a gatorade bottle and a bit of a coke can as a pc and you and your mate have nothing else to do so you have a few cones with some low grade bud.
9 times out of 10 doubles as a hospital trip if yous do it right
you: OH SHIT MATE!! LOOK!! ITS A WONKEY DONKEY BILLY BONGEY!!!
ur mate: OH FUK YEAH!!! LETS USE IT!!!!
*5 hours later ur both dead*
For very naughty children who think it's funny to threaten/berate/have go's at other children.
Teacher: I have received a complaint on you for harassment. I am going to expel you.
You: NOOO!!! SIR THAT ISNT FAIRRRR!!!!!!! PLS HAVE MERCUY PLS
Teacher: Okay, fine. Have a few Friday Detention's.
like the australian noun "chat" but you add mat at the end when something really makes your blood boil. chat mat's are absolute incels with no rhyme or reason to exit other than to piss you off.
you: omg look, its chat mat himself.
your mate: stop being salty he rejected you and get over him