A concept a depressed person likes to use to decribe their lack of joy for life and anything in it. A concept to keep you buying more and more products and to keep searching for endless thrills till you end up an empty shell; till you have nothing more to enjoy because.... well... everything is so cliche. Like the word narcissist it is over used to encompass everything.
Angela: I love you!!
depressed person: Oh, that is so Cliche, I wouldn't be caught dead repying with "i love you"..... are we on a tv set now with celine dion?
BoB: I just bought these nike air shoes
John: don't be such a try hard, that is so 'yesterday' already.