When you take two quarter pounders,(the meat in them at least), and put it in your partners buttocks and then make love to it using the grease from the burgers as lube.
Ya me and my girlfriend did the McDick last night and it worked like a charm. Only problem was my meat smelt like meat after.
Losing your virginity to a slapper, only lasting three seconds before one ejaculates. Two thrusts.
Haha that guy only had a Mcdick last night, what a bender.