bcash is a nickname created by the Bitcoin Cash community to remind us that we are suppose to Be Cash. For a while it was being used as a insult but now the word is being reappropriated.
The french word gueux means beggar. It was used by the spanish conquistadors as an insult to refer to dutch nobility that was resisting the spanish conquerors.
But the dutch managed to change the meaning of the word from an insult to a term of honor.
And so to be a bcasher, might now still have a negative connotation. One day it will make bankers poop their pants when they hear it.