Thread:Amonimus/@comment-5916303-20200610201533/@comment-5238398-20201008115129

Deadmau5's track is even included in the game as part of the cameo.

Quarantannus is basically a challenge started in Desperately Trying To Not Touch Our Faces and continuing in Going on an Internet Scavenger Hunt, Touchusannus is probably a fan nickname for it, or specifically when the challenge fails.