Green’s Dictionary of Slang

1. coal.

1992

R. Puxley Cockney Rabbit.

2. a hole.

1969		S.T. Kendall Up the Frog.
1992		R. Puxley Cockney Rabbit.

3. the anus [= hole n.¹ (1)].

2003

B. Dark Dirty Cockney Rhy. Sl.