A term used to describe an event, person or occurence which is deemed to be unpleasant, unfortunate, disapointing or altogether crap. Similar meaning to the phrase "long".
Shegging is an advanced form of negging resulting in shagging.
The attribute of a shegger is the ability to put her down to make her go down.
Once you have mastered the ability to undermine a womans confidence, disarming her feline powers, only to use them against her, you are eligible for the title of a shegger. Negging is the tactic. Shagging is the goal.
Girl 1: Seamus was such a dick to you last night Girl 2: Yeah i known, but ......
Girl 1: No way, did you sleep with him
Girl 2: I was proving him wrong. He said I would be a lazy lay.... fuck, he was shegging me