Can Your Granny Sew? Edit Meaning

1.

A delicate way of telling someone you are about to perform an act of violence upon them, esp. the application of a Liverpool Kiss to the nose or the use of a Stanley knife. Follwed up by the action, then the use of the phrase " Then get THAT stitched!" Scottish traditional folk saying.

English man in pub;"Celtic Thistle are not doig well this year..."

Scot:"Oh Aye? Can your granny sew, mate?"