It's actually a parody of the dance move that is performed by EXILE in their PV and later by OKAXILE (A collaboration unit between EXILE and comedian Okamura Takashi) for the song Choo Choo Train.
You're late my assistant!In the stationWhy are you running away!Where are they, I thought they were going to pick me up...WAHAHAHA!*walking away**choo-choo*Fun fun we hit the step step
Lyric from the song Choo Choo Train that released in 2003 by EXILE, Japanese pop dance group.Come and jump into my arms!
