Nyanbo is the action used by The Tissue Taros to win 1000000 yen from the Comedy Grand Prix. Found in episode 45 "Five Blue Rangers".
How do you do the "Nyanbo"?Edit
To do the Nyanbo, bend your knees slightly forward, stick your butt out and up as far as you can, then hold both hands in front of you. With a straight, 90 degree face, say "Nyanbo!".