Fairy bower = a shower
Fancy sash = to bash
Farmer Giles = the piles
Fiddles and flutes = the boots
Fiddley-did = a quid (one pound sterling)
Fleas and itches = the pictures (cinema)
Fleas and scratches = matches
Forgive and forget = a cigarette
Four by two = a jew
Four and twenty = plenty
Fred Astaire = a chair
Fred Astaire = the hair
Fred Astaire = a lair (a show off)
Fried rice = the price
Frog and Toad = the road
Froth and bubble = the daily double (horse racing)
Froth and bubble = trouble