Lump

"Lump" by The Presidents of the United States of America  is featured in Just Dance.

Appearance of the dancer
The dancer wears blue pajamas, dog slippers, and orange curly hair. If you look closely, you'll see that he also wears round glasses.

Background
The coach is dancing in the kitchen. Red bubbles fly around while he dances.

Shake Moves
He plays air guitar. Done during "She's in my head" and "She might be dead."

Trivia

 * The avatar looks like a girl, but he is actually a boy.
 * This routine has six shake moves, more than any other routine in the game.