Etymology
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git (n.)

"worthless person," 1946, British slang, a southern variant of Scottish get "illegitimate child, brat," which is attested by 1706 ("Gregor Burgess protested against the said Allane that called him a witch gyt or bratt"), according to "Dictionary of the Scots Language"); related to beget on the notion of "what is got." Scots get, gyt, geitt, etc. also can be an affectionate term for a child. 

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Definitions of git

git (n.)
a person who is deemed to be despicable or contemptible;
the British call a contemptible person a `git'
Synonyms: rotter / dirty dog / rat / skunk / stinker / stinkpot / bum / puke / crumb / lowlife / scum bag / so-and-so
From wordnet.princeton.edu