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Nothing, zip, zero. Jolly term to describe the abscence of an item sought.

Suggested origin is from the Cockney rhyming slang 'Sausage and mash' used to mean 'cash', or money. Hence 'not a sausage' to mean 'no cash' or 'nothing'.
Is there anything in the cupboard?
Not a sausage.
by Paul Ruane March 13, 2006
Colloquialism: "nothing at all".

Comes from English slang; exact origin is unknown.
"There's nothing in the fridge," said Richard. "Not a sausage."
by ke6isf January 31, 2005