"Ohh Posh" means someone who thinks that they are better than everyone else. No matter if they are posh or not! This person will only buy the best of everything. But can often not afford it because their are soo poor. They think that they are even too posh to talk to you!
Ohh Posh, look at her dripping in vivian westwood!
"Ohh yes i bought it on daddys credit card".