You've never heard Mamma Mia! sung like this before.
The actress kicked things off by singing a rendition of "Dancing Queen," which translated to "Hula Prince." Fallon went next and belted out a version of "Take a Chance on Me," which translated to "Steal My Sad Clocks."
For the grand finale, the two performed a duet of the showstopper "Mamma Mia!," which was now called "My Mom Arrived."
Watch the video to hear them sing the silly tunes.