FITTER. A fellow that fits keys to locks for burglars.
FIZZLE. To escape. "The cove made a fizzle," the fellow escaped.
FIZZLED. Broke up; fell through.
FLAG ABOUT. A low strumpet.
FLAM. To humbug. "Flam the bloke," humbug the fellow.
FLAME. A mistress.
FLAPPERS. Hands.
FLASH. Knowing; to understand another's meaning; to "patter flash," to speak knowingly.
FLASH HER DILES. Spend her money.
FLASH PANNY. A house resorted to by rogues of both sexes.