Green’s Dictionary of Slang

pie and mash n.

[rhy. sl. ]

1. money [= SE cash].

1992		R. Puxley Cockney Rabbit.
2002		B. Kirkpatrick Wicked Cockney Rhy. Sl.

2. an act of urination [= slash n. (2a)].

1992		R. Puxley Cockney Rabbit.
2002		B. Kirkpatrick Wicked Cockney Rhy. Sl.