Interesting pin

[Caradoc]

I also can't find anything for corborundum, but it does have an entry for "grind down", opprimo (3), and "grind", contero (3). But, my dictionary isn't a large one. I need to invest in a comprehensive Latin dictionary and Medieval Latin dictionary.

That won't help, as carborundum isn't a Latin word. (Nor corborundum, but that's a misspelling.) "Carborundum" is actually a trademarked name for an abrasive, from what I've read.

[Schultz]

Even though it's Wikipedia, this entry does a good job explaining the phrase.

[kiltimabar]

"MocK" Latin it may be, but I like it anyway; it expresses the thought better than the correct Latin translation.

[ozmeath]

It works well even if it's not entirely gramatically spot on. Psuedo -Latin is fine by me if it can circumscribo what one needs to circumeo.
Man I got no idea if that made any sence, I'm winging it...