Green’s Dictionary of Slang

baker’s dozen n.²

[rhy. sl.]

a cousin.

1960		J. Franklyn Dict. Rhy. Sl.
1969		S.T. Kendall Up the Frog.
1984		Partridge DSUE (8th edn) 42/1: late C.19–20.
1992		R. Puxley Cockney Rabbit.
2002		B. Kirkpatrick Wicked Cockney Rhy. Sl.