Stan had lost a bet. That bet was that he had to wear a wig to school for a whole week and dress up like a girl. Of course, he was pissed off by this but had to hold up his end of the deal. ON the first day, while he was walking with kyle and everyone was looking at stan and one of these people was Stan's girlfriend, wendy Testaburger. She walked up to him while snickering but liking his style

Wendy: hey babe...nice outfit snickering