An abbreviation for: FIND THEM, FEEL THEM, FUCK THEM, AND FORGET THEM, a slogan advocating casual sexual relationships with no emotional or romantic involvement. This credo of lechery is thought to be of recent coinage, but it's origin dates back to the 1930s and the movie I'm No Angel (1933) starring Mae West who, as Tira, tells a friend: 'Never let a man worry your mind. Find 'em, fool 'em, and forget 'em'.
Occasionally, it also stands for:
a) Find, fool, frig, and forget( 'em).
b) Fucked by the Fickle Finger of Fate.
See also: 3-Fs.