What is a "bernie"?

Proper nouns are not playable in Scrabble, but I know (from studying words) that "bernie" and "bernies" is playable in Scrabble. But I cannot find a definition for the lowercase version anywhere online.

Help?

Apparently, in 1999, someone named Bernie Ecclestone tried to donate one million British pounds to the Labour Party, and since then, a "bernie" is a million pounds.

Bernie is the corrected (or corrupted, depending on your outlook) spelling of the Old English word byrnie, which is a type of armor used by knights for the purpose of protecting the body when engaged in fighting with swords, lances, dirks, maces, pikes and/or other type of sharp, metal objects used to kill others.