Green’s Dictionary of Slang

1. butter.

1859, 1860		Hotten Dict. of Modern Sl. etc.
1873		Sl. Dict.
1935		A.J. Pollock Und. Speaks.
1944		Maurer & Baker ‘“Aus.” Rhyming Argot’ in AS XIX:3 192/1: Danny Tucker or Danny Rucker. Butter.

2. by ext., breakfast.

1893

P.H. Emerson Signor Lippo 48: Come down and have a bit of Dan Tucker, for I was up at day’s dawning bona darkie.