look up any word, like timebomb:

1 definition by musterionanonim

 
1.
FI
fiancé, the man who a woman is engaged to be married to
my FI has huge fingers. The jeweler measured him at a 15.5 but said to order a 16 if we wanted a thicker band. My FI is 6'4" and a big guy so it makes sense.
by musterionanonim February 21, 2013