To have any area of your ass violated at anytime without your knowledge. Usually in reference to a pre-meditated attack on the ass, with the victim completely unaware of the violation.
My dad went to his annual work Christmas party last night and got so drunk that he passed out in the store room. He woke up hours later only to realise he had been assasinassed whilst unconscious.
by Basil Bastardson December 11, 2006