Fingers in his ass is a meme mainly quoted/said by Danganronpa fans on a site called tumblr or Danganronpa fans in general.
The sentence is usually associated with the pairing
sansmaeda. There is also a thing called fingers in his all sunday. On Sundays people gather to appreciate the song fingers in ass and sansmaeda. On December 16th 2018, the day before
tumblr's adult content ban fans of sansmaeda and
fingers in his ass sunday celebrated what was called the "final" fingers in his ass sunday.
Origins:
On july 17th, 2017 user named skeletortilla uploaded a video on tumblr that had Nagito Komaeda from Danganronpa 2 and Sans from Undertale dancing together to a song called "ASSHOLE (Fingerfückung)" made by BotanicSage on youtube.
