A pejorative whose original meaning was a second-generation bastard. Therefore it directly connotates as being the male equivalent of "son of a bitch". Modern usage, however (or at least in Scotland, and certain other parts of the UK), has tended towards the word having a bipartite meaning and inflection. It can, on one hand be an insult, and yet on the other can be something said between friends... e.g. sad git (loser); tight-fisted git (miser); etc., etc.