can some one tell what the frick frack an eraser is?

This is basically an eraser. It can also be a rubber not attached to a pencil.
It gets rid of pencil marks and stuff.
I'm guessing por your use of the word "mate", you're Australian? Hmm...interesting, I guess Australians use the word rubber instead of eraser xP

It's a thing that erases pencil marks. It steadily gets smaller as tu use it. tu can also draw on it and make it an animal. It's here and in many other places in the world. I think. It can only erase pencil marks.

The eraser is the nickname for the rubber that erases the pencil marks that tu want to erase. Nailed it!

If tu know what a pencil is then tu will know what a eraser is. if tu dont then your just plain stupid.

It's a rubber :| That just what weird people call it

It's a rubber. The majority of the world call it rubber, but the US and Canada say eraser.

How can tu not know what that is? The eraser is a code on the pencil if tu know what I mean. Used to erase stuff. Like I can easily erase the files of a game if I want to. It's very easy.