Oxfam has a large number of charity shops all around the world, where clothes and other items are sold at a cheap price in order to keep the organisation running.
Many people regard 'Oxfam' as cheap and dirty, because the clothes and items for sale in Oxfam were donated and were seen as worthless before they were sold. The person wearing second-hand clothes purchased from Oxfam may be seen a scrubber, however the person wearing the clothes will feel they have bought cool, good quality clothes for a cheap price.
Boy #2: Yes, the clothes were cheap and purchased from Oxfam but I am proud that this money has gone to a worthy charity and that I haven't paid through the nose for them.
Idiot 2: Oh My God! You Loser!
Me: Oh, shut up!