not on your nelly

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not on your nelly

An expression of one's refusal to do something. A: "Will you go out to the barn and clean up after the horses?" B: "Not on your nelly!"
See also: not, on

not on your nelly

BRITISH, INFORMAL, OLD-FASHIONED
You can say not on your nelly to mean that there is no chance at all of something happening. Note: `Nelly' is sometimes spelled `nellie'. Will I be attending the ceremony? Not on your nelly! Note: This expression may come from cockney rhyming slang. `Not on your Nellie Duff' stands for `not on your puff', which also means `definitely not'.
See also: not, on