1. Expression annoyance or dispair.
2. Dammit Rob!shifts the blame of any mistake or misfortune away from yourself and onto the closest innocent bystander who instantly becomes "rob".
*Always results in someone saying "huh?". that person then instantly becomes rob.*
2.guy: Who the hell used my toothbrush!?
guy2: Dammit rob! *points at random other guy*
doctor: I'm very sorry.....you have cancer.
guy: Dammit rob!