an example of tough-talk. Adding an "O" onto the end of a name is a way to further familiarize that person,
like Jacko or Danno; the same goes in Spanish by adding "-ito" to the end of names- Pablito, Pappito, etc. however, because the word being used here is "friend", the resultant "friendo" is intended as
sarcasm. as in the stylistic flim "No Country..", which popularized it, the antogonist using it clearly has no concern for his subject, evidenced by the fact that on a whim, (a coin-
toss), he could instantly
kill his muse. Similarly, using the word bucko, buddy, or
pal while addressing someone can imply a slight threat to them, given the context. Clint Eastwood was a master in this camp.