Enema Bulldozer
The act of ejaculating semen into the partner's rectum, then while the penis is still inserted, the person begins urinating in the anal cavity. Then when finished, the person pulls out the penis and punches the partner in the ass while the urine and semenal fluid oozes out.
Did you hear about Marcus? He didn't come to school today because Stanley gave him one hell of an Enema Bulldozer last night.