When a rather rude, obnoxious and possibly mentally handicapped being resides in turning fellow beings around him into the same likeness. He also likes to grope unexpectedly and stab gypsies. This being normally goes by the name of 'Martin'.
"I say Jeebs, look it's Martin!" *GASP* "Quite so, cover your privates and bum hole becuase he might try Martination upon us old beans"