Typically they are called Nicki or Fran.
They also make fools out of themselves on videos on youtube i.e. woodstoke 4. But this is due to their sever mental disabilities. You must pity them as they think they are cool and attractive, this is also due to their tiny mental abilities.
Alternatives are 'spaz' or 'mongole'.
Mother: You shouldn't be unkind, they are people too
Small child: Eugh! Look at that one windowlicker with the snotty nose!
Mother: Tee hee! They are funny aren't they!