This bun reminds me of the little angular figure 8 doodle I used to see everybody drawing in high school.
Begin with two piggies, one on top of the other. Put the elastic of the top one right at the edge of the part so that the part will not show.
Split each of the tails into two sections. Twist one of the sections and wrap it around the elastic, tucking in the loose ends. Bobby pin in place. Repeat for other piggy.
Twist the remaining tail of the top bun. Drop it down to the bottom bun and wrap it around the outside of the other bun. Tuck in the ends, and pin in place.
Twist the last tail. Pull it up and around the top bun. Tuck in the ends and pin.
All twists should be done in the same direction, whether it be clockwise or counterclockwise.