"Grubby Man" (or Grubby) is a fictional character in the Hey Arnold! TV Series. Not much is known about him, but it can be presumed that he doesn't have a job, and is homeless. His real name is unknown. He appears to be somewhat insane as he believe's the subway train to be his house and constantly yells at people to get out. It is also he who starts the song at the end of the episode "Das Subway".