An expression term which probably originated in some 19th century
war, indicating that the bullet that had just stuck you hadn't pierced anything immediately life-threatening1
and that you should go back to the front line and start giving people more serious things than flesh wounds. It's very similar to walk it off
The term then migrated to bad cop/war/detective movies and stories, indicating a degree of macho stoicism
that was part and parcel of doing one's duty
This was, of course, used to hilarious effect in Monty Python and the Search for the Holy Grail
. If you don't know where, you better see the movie.2
You could still bleed to death, so they sometimes gave you a bandage.
At least eight times.