Pitty-pat isn't for little kids, and grill face has nothing to do with the front of a truck. Get your stepping terms straight:

Stepping: Intense dance in which the feet and hands are used as instruments; often a synchronized line dance; rooted in African history and adapted by many black fraternities and sororities into a competitive art form.

Stomping: Synonym for stepping.

Step master: Captain of the step team, sometimes a choreographer, often a lead stepper and the caller in "call-and-response."

Call and response: A musical form sometimes embedded in step routines. The step master begins with a move, then cues other steppers to join in. 

Grill face or mug face: The serious expression worn by steppers, especially when competing.  more >>