1. A very popular 'old school' dish in London, namely the East End. Consists of a Pie containing just Minced Beef and a serving of Mashed Potato. Commonly covered with 'Liquor' (Pronounced 'Licker'), which is an almost flavourless sauce consisting of flour, water and parsley.

2. Cockney rhyming slang for 'Slash', meaning to urinate.

3. A slang term for 'Gash' referring to the female genitalia. Although in this case, it is used to refer to any type of sexual contact with a partner, not just 'Gash'

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cockney rhyming slang for slash (to urinate)

London, UK.
Historically, the pies were made from scraps of beef and vegetables, leftovers or from the local markets, under a pastry crust. The mashed potatoes were liberally covered in parsley gravy or "liquor". There has been a great revival in these dishes and quite a number of Pie ‘n’ Mash restaurants can now be found across London.