I remember hearing the phrase “rogue buddy,” back in the early 1970s, although some people pronounced it as “road buddy.” Was this common lexicon back then or was it more likely just a localism (Southeastern US)? Some cursory Googling reveals the phrase showing up in various places, but that could be unrelated.
Use it in a sentence that you might have heard back in the day. I’m not familiar with it.
It just meant “good friend.” Like “Matthew here is my rogue buddy.” I don’t think it meant anything more than that.
For all I know it was limited to our school. That sort of thing does happen.