Definition
not on your life, an emphatic form of no.
Origins
From nelly, Nelly Duff, rhyming slang for puff (of breath = life).
Also Said As
- not in a million years
- not likely
- not on your life
- no way
- no way Jose
- when pigs fly
- a cold day in Hell
How People Actually Use It
cockney rhyming slang for not on your life. nelly rhymes with smelly, which leads to smelly breath, breath leads to breathing to keep alive, leading to not on your life.
"Martin: 'will you stroke my furry badger?' Jon: 'Not on your nelly!'"
Source: Urban Dictionary