a shortened version of "Nelly Duff". Nelly Duff = puff (breath) in Cockney rhyming slang. 'Not on your Nelly' is used to mean 'Not on your life'. "Breath" is synecdochical for "life"
See:
http://www.english-for-students.com/Cockney-Rhyming-Slang-N.html
Steve
See:
http://www.english-for-students.com/Cockney-Rhyming-Slang-N.html
Steve
by SteveB47 March 25, 2009

by Ronny St Papps December 26, 2004

by meme rememe May 26, 2020

Q: What time is it?
A: Your mum.
Q: Under which of the true sciences should philosophy be classified?
A: Your mum.
etc.
A: Your mum.
Q: Under which of the true sciences should philosophy be classified?
A: Your mum.
etc.
by phantom oddity January 9, 2004

by AAaaalRightythen March 7, 2008

by Urban potato December 10, 2017

by Nowhere to go April 11, 2013
