Not mis-heard, but rather how we usually refer to tunes (gosh, most of these are rude, what does this say about the sort of people I go to sessions with?):

Banish Misfortune - Banished Man's Foreskin
Jenny's Picking Cockles - Jenny's Pickling Cocks
The Nine Points of Roguery - Nine Pints of Buggery
Canongate Twitch - Canongate Itch
Mason's Apron - My Son's a Prawn
The Night We Had The Goats - hell, that one's funny enough as it is

They're not big or clever but they still raise a smile after several pints of Old 'n Nasty