A slang expression from the US Army, it originated during the Vietnam War and may be derived from the Vietnamese “di di mau", meaning to go quickly. Usage by American troops altered the meaning somewhat so that it referred to walking with dance steps or with an exaggerated swagger. It was used in the context of walking carelessly whilst on patrol in enemy territory, without paying proper attention to your surroundings and putting yourself and other members of the patrol at risk. The meaning later expanded to include moving or acting without considering other people.
A sex game that is played much like the Nintendo 64 version. As the penis is being inserted into the vagina, the man clearly states "Get Ready...GO!" much like the beginning of an N64 race. As the woman orgasms for the first time, the man says "Lap 2". The second time she orgasms he says "Final Lap" and when he busts a load, he yells "FINISH!" Cumming before the final lap is strictly prohibited.