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Another name for a ladies genitals, but one from a particularly scabby lady. Similar to the Australian 'Raw Prawn Sarnie' but for low life fat sweaty people who will most likely turn up on Jeremy Kyle or similar chat show's discussing how their partner cheated on them with next doors dog.

The distinctive part of a Blackpool sandwich is the smell, which much like the city is named after, smells of a mix of rotten fish and sewage.
Ohhhh bloody nora lass, close your legs i can smell your blackpool sandwich
by Don Cheeseman October 28, 2014
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