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1.
its a scottish slang for something is shit.
awww that reaks of sheggy!
or your talkin sheggy!
by TR1LL-- C33 July 10, 2008
 
2.
When a person thinks they are big and own the shot.
Usually refers to a man that owns a suped up car and thinks they are a boy racer.
Also refers to a guy that refers to their mate as sheg.
You out on the pull tonight sheg!
Guy thinking he owns the shot whilst driving around a Citroen Saxo (also known as a Sheggy Saxo)
by Fragged82 October 19, 2011