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1.
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
 
2.
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