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Noun. Pakistani. British Rhyming slang.
"That bloke who lives up the road is a bacon sarnie, iznee."

"Does it matter?"
by Dylan Hewson August 02, 2005
A subtle euphemism for a threesome with two woman and one man.
A guy might inquire: "How would you two lovely ladies like to come back to mine for a bacon sarnie?"
by Rombéthor January 10, 2010