http://en.wikipedia.org/wiki/Sic
It's a joke. MoxCo. has quoted sligpatrol as saying 'sic background', but has presumed that sligpatrol really meant to type 'sick', what with all the backwards-talk the cool kids are using these days.
MoxCo. has given a disclaimer which effectively means 'I didn't make this mistake, it was in the original post'. This, hilariously, is also "[sic]".