A rope or halter made of flexible twigs, or withes, as ofbirch. [Scot.]
A Widdy (sometimes spelled Widdie) is someone who flexes their intellect (usually on internet forums) in an attempt to make people think that they are cleverer than they actually are.
Someone who believes their knowledge and use of the aphostrophe somehow gives them superior intellect to the average internet user. Conversely it highlights their inability to interact socially both in real life and online.
The term comes from fans of Conservative MP Anne Widdecom and her stuffy anal love of correct grammar and use of Queens English