J Arther rank = a wank (to masturbate)
Jackaranda = a gander (to look at)
Jack and Jill = a dill (a fool)
Jack and Jill = a hill
Jack and jill = a bill
Jack and Dandy = a shandy (beer and lemonade)
Jack Flash = hash (hasheesh)
Jack horner = corner
Jack Rees = fleas
Jack Scratches = the matches
Jack O'Shay = to stay
Jack the Dancer = cancer
Jam tart = me heart
Jim Gerald = The Herald (newspaper)
Jimmy Bourke = a jerk (a foolish person)
Jimmy Britts = the shits
Jimmy Lee = tea
Jimmy Riddle = a piddle
Jimminy cricket = a wicket (cricket)
Joe Blake = a snake
Joe Blakes = the shakes (the D.T.s)
Joe Hope = the soap
Joe Rocks = the socks
Joe Wits = tits
Johnny Hopper = a copper (policeman)
Johnny Cash = hash (hasheesh)
Johny Horner = a corner
Johnny Raper = newspaper