bricking it means you messed up loading CF on it and have rendered it useless unless you make a pandoras battery and pandoras magic memory stick. But you will obviously not be doing the unbricking if you bricked i in the first place
Brick is the slang term for an electronic device which cannot function (or has been rendered useless by damaged firmware). This comes from the fact that the device in question can be considered only as useful as a brick, and little else.