BEARword is the word-by-word translation of the german term BÄRwort. A BÄRwort is a word, which has a syllable that pronounced sounds like BÄR.
Example: sauber is the german word for clean. It is pronounced like SauBÄR wich could be tanslated as pig bear.
With a little imagination you might guess what a funny beast that would be.

You got it, it's all about some kind of german wordplay. If you are still interrested, go on here.