This means the same thing as, "Beat it," or, "Get the hell outta here," or, "Yeah, the door is this way, pal."
When Wayne's job interview was going poorly and he had a fight with the interviewer, the interviewer kindly asked him to leave by saying, "Yeah, Don't let the door hit you on the ass, buddy."
by Billthrill1 April 21, 2007
Get the Don't let the door hit you on the assmug.