[fork out] {v.} To pay out, usually with some reluctance.

[foul-up] {n.} (stress on "foul") 1. {informal} A confused situation; confusion; […]

[four bits] {n.}, {slang} Fifty cents. * /Tickets to the play […]

[four-eyes] {n.}, {slang} A person who wears glasses. - A rude […]

[FP] "First post"; originally used on Slashdot

[frag] To kill or tear to pieces. Its origin comes the […]

[freak] {n.}, {slang} 1. A good, or well-liked person, the opposite […]

[freak out] (2) {v. phr.}, {slang} To lose control over one's […]

[freak-out] (1) {n.}, {slang} An act of losing control; a situation […]

[French letter] {n.} Condom.