Green’s Dictionary of Slang

1. a fool [= mug n.¹ (2a)].

1952		B. MacMahon Children of the Rainbow 130: Hold your tongue, Toby-jug!
1982		P. Radley My Blue-Checker Corker 130: ‘You little toby,’ he said. ‘You know better than that’.

2. an ear [= lug n.¹ ].

1992

R. Puxley Cockney Rabbit.