A less traditional, and perhaps more endearing, name for one's fiancé. Often used by those who prefer a non-traditional view of everything wedding-related. A combination of the words "future" and "hubby" (short for husband).
The true definition of fubby is that it has no definition. There is, however, one exception; it is the feeling you get after a dentist visit when your mouth has been numbed. It's great!