[FTW] "For the win"; Indicates the end of the game, it […]

[FUD] "Fear, uncertainty and doubt"; purposeful spread of misinformation.

[full of beans] {adj. phr.}, {slang} 1. Full of pep; feeling […]

[fun and games] {n.}, {slang}, {informal} 1. A party or other […]

[fuzz (the)] {n.} The police.

[FWIW] "For what it's worth"

[FXP] "File exchange protocol"

[FYI] "For your information" (predates the Internet)

[G] "Grin", normally written *G* or <G> to separate it from […]

[g,d&r] "Grins, ducks and runs"; used after a particularly bad joke, […]