It's used in quotationsto indicate that this is what the person actually said/wrote, but the writer knows it's wrong and is using the (sic) to basically say 'Fuck off you pedants, I know this is wrong, but the dumbass used it and I have to because it's a quote. So stick your whining letters of correction up your excessively tight sphincters.'
(,
Mon 11 Apr 2005, 6:37,
archived)