BB, bb, Blitz: Shorter names for Bejeweled Blitz
Cascade: When a player makes a valid move, and the falling gems produce at least one or more subsequent matches automatically without further player moves.
Coin Stack: The total amount of coins you have obtained to date while playing Bejeweled Blitz
FB, fb: Shorter names for Facebook
FBC, fbc: Facebook Credit
Practice Mode (a.k.a. Free Play Mode): Play Bejeweled Blitz without spending any of your earned coins. In this mode, you will increase your overall coin stack.