In this iteration of the series, the way you go about unlocking new dance routines is to "collect" moves in other routines. To collect a move, you have to score a Flawless on that move.
To unlock the needed routine, you have to collect enough moves in the Beginner routine for "Talk Dirty" - Jason Derulo ft. 2 Chainz. Perfecting it will be enough to unlock the Goofy routine, which you then play through as Glitch. You don't have to earn a particular score or unlock any number of moves. Just complete the routine.