Murhapuro (Murderstream) is an alter ego of Uuno Turhapuro (Useless-stream) who once was tasked to look after a couple of pretty girls for a day and he introduced himself to them as Detective Murhapuro, telling them to stay really close to him so he can protect them.
A bit from
wiki:
Uuno Turhapuro is a Finnish comedy character created by Spede Pasanen and played by Vesa-Matti Loiri. Originally appeared in Spede Show during 1971–1973, the character gained popularity through the Uuno Turhapuro films.
Uuno is a ragged man, characterised by his tattered, sleeveless shirt, sparse row of teeth and untidy face, perhaps depicting a Finnish stereotype of loser. His wife Elisabeth Turhapuro (played by Marjatta Raita) is the daughter of rich mining Councillor Tuura (Tapio Hämäläinen). In the beginning of the first film, in the couple's wedding, Uuno is tidy and cleanly, but gets ragged and lazy immediately after getting married to a rich woman. Uuno's main pastime is lying on the couch, overeating, and getting his hands on his father-in-law's money. His biggest virtue is his gift of gab that he uses in settling marital problems, cadging free hot dogs from the stand and seducing other women.
I picked him as my cmdr name as I don't have imagination of my own, and my sleeping and eating habits are pretty much the same as his.
Well.. My forum id would have been pretty much spot on I guess. Never had nickname.
Anyway, I guess that is a mouthful for english speakers so just call me Murphy or Frank if I happen to be on TS one day.