All these slangs are the creations of Boys n Girls of Senior High or collegiates who are so,"I feel so embarrased" or "She/He is soooo dated, Duh!" or "Did you see that dress and the accent, its soo fobish !"
Slangs can be so unjustified to use against the "New arrivals" because they'r already in a double wammy situation. New Culture, New People and the worse is "their type totaly local born new allienated breed" who would not welcome them open heartedly, but rather feel "Embarrased" in their company.
Hence the ^ slangs.
It is false and totaly goes against the so called "Advance Breed" who chooses to use these slangs on daily basis.
PS: FOB was first used by California's so called elite kids for Vietnam Refugees landing on its shore line on daily basis.
Kids in the US and Brit have double dellema, most of them are not accepted within as 'locals' neither they can prove a point of belongingness to their encestorial home country. It is regretable but its true.
Ofcourse! situation can vary from state to state and depends on severity or leniency in many cases. IMO