Da Zeg is a variation on the word Marmaduke Smarmy. It usually means "Intolerant Asshole" except De Zeg is usually referred to in the case of the person who you are calling it's country being right next to yours. Like a neighbour. The main use of Da Zeg is modern society is to describe Scottish people from England, as we all know the stupid, unintelligent stereotypes are usually correct about Scottish people so we use this as a description of them wankstains.
Awsum Englishman: Look at this Scotsman walking up to me
Stupid Scot: I HATE YOUR COUNTRY.
Awsum Englishman 2: Dude...WTF....stupid Da Zeg bastard.