2. A person who feels justified in their callow behaviour.
3. A pubescent kid who thinks it's totally cool to act like a moron on the internet, only because no one can actually reach through the screen and punch their lights out.
Also: "Some total git has made it so that this example must have over 20 letters, hence this little add on."
It's more positive these days.
The origins are from the word 'geat' which were a Scandinavian people living in Götaland, land of the Geats, currently within the borders of modern Sweden. The name of the Geats lives on in the Swedish counties of Västergötland and Östergötland, the Western and Eastern lands of the Geats, as well as in many toponyms.
From the english dialect "Git" or "Get" meaning "Gate". When using foundry sand to cast iron objects the access point for the metal, that is the funnel shape that lets the molten iron into the sand-mould was called the gate. This gate was of no use and would have to be removed from the final item and the item carefully finished to remove any blemishes caused by the gate. Thus the term "Useless gate (git)" was coined.
Welshman : "Shut up and piss off you useless git"