my eye (or all my eye and Betty Martin) nonsense. informal, dated
☞ Who or what Betty Martin was has never been satisfactorily explained. Another version of the saying also in use in the late 18th century was all my eye and my elbow.
1991Robertson DaviesMurther & Walking Spirits Of course many of the grievances are all my eye and Betty Martin (Anna has picked up this soldier's phrase from her husband and likes to use it to show how thoroughly British she has become).