Fakes is an Egyptian slang word that is commonly used to express refusal/disapproval of a situation, object, or person.
Otherwise, Fakes and its derivatives may be used to express failure or a situation when a certain plan or action gets discontinued.
- Hey Joey, do you want to take a walk?
= Fakes, my legs hurt.
- Did you listen to Justin Bieber's new song?
= No, that dude is fakes.
- Did you talk to your boss about the raise you want?
= No, Fakast, because he was in a bad mood today.