the blunt end of a bowl of marijuana being smoked, this smoke, or the "ass hit", tastes very similar to the smoke generated from a moldy wet banana peel burning on a citronella candle.
johnny was very poor, when he smoked weed he always made sure to take the "ass hit" to insure he got his moneys worth of marijuana
This means the same thing as, "Beat it," or, "Get the helloutta 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 doorhit you on the ass, buddy."