Using the adjective 'indelible' with a bad connotation. When you say something is indelible, you are saying that it is indelibly retarded. As in, the subject's stupidity leaves a lasting mark on you. It can also be used as a noun to describe someone who is indelible.
You left your car running in the parking lot for two hours unattended! You are indelible.
Stop being such an indelible.