FE = For Example/Fatal Error
FF&PN = Fresh Fields And PasturesNew
FOAF = Friend Of A Friend
FTASB = Faster Than A Speeding Bullet
FT = Faint
FTL = Faster Than Light
FTTB = For The Time Being

FUBAR = Fed Up Beyond All Recognition
FUBB = Fed Up Beyond Belief
FWIW = For What It’s Worth
FYA = For Your Amusement
FYI = For Your Information
FYM = For Your Misinformation
G:
G2G = Got To Go
G8T/GR8 = Great
GAL = Get A Life
GDGD = Good,Good
GF = girlfriend
GG = Good Game/Gotta Go
GIGO = Garbage In, Garbage Out