when a girls hair is incredibly unkept because of going to sleep drunk after a night of partying. not uncommon is to find little pieces of food and clumps from drooling while sleeping.
this most often occurs on friday after a late thursday night but the girl is to lazy to do her hair because she knows she will have to when she goes out again later that night.
tony: omg look at that coke addict, she looks a little like sara, that whore deff has aids
rachel: no, that IS sara, looks like shes suffering from a case of friday hair