What is the meaning of the bum the midninght oil in idiom?

First, you need to learn how to USE the Spell-check program. I'm not sure if you're just a terrible speller or if you really think the Words look like that in English.

There is no idiom that says "bum the midninght oil." There is one that says "burn the midnightoil," which is fairly easy to figure out. If you're burning oil at midnight, you're working way past normal hours and are working too hard.