I was in middle school in the late 80's and HS in the early-mid 90's. One phrase that I think may have been specific to our area was "retread". It was used as an insult because we weren't allowed (at school anyway, which is where I usually heard it) to call anyone retarded. So somebody came up with the insult 'retread'.
I think we also used the term 'gay' a lot as kind of an insult. Like "OMG that's SO gay!".