All my eye (and Betty Martin)
All my eye and Betty Martin is a quaint British expression that dates from the late 18th century and was a standard retort to someone talking rubbish or humbug. Who Betty Martin is or was remains a mystery. By the early 19th century, it had shortened to ‘all my eye’ or simply ‘my eye’. In the late 19th century, a variant that was frequently used was ‘all my eye and my grandmother’.