Derived from the German word "furchtbar", meaning frightful, simply because one or more individuals thought "furchtbar" sounded like, seriously or humerously, "fuckbars". Its current use has no relationship to the source word; it is used as an expression of disappointment or, occasionally, anger.
1. Aw fuckbars, the toilet is stopped up again.
2. Fuckbars! That hurt!