Big Willie Style is a shock-style sex move. It is
accomplished by first having regular
intercourse between a girl and a guy, but right as the guy is about to cum, he pulls out, plunges it into the girl's ass, and unleashes his load while singing "
Na na na na na na na - gettin jiggy wid it," the classic hit by Will Smith. A greater effect is added if the guy raises the roof while doing this.