A side buster is someone that buts into a conversation out of no where. In the case of the Rifleman Luke always showed up out of nowhere and got involved with situations that strangers felt was none of his business being that he was not the sherrif. Strangers never knew if he was a ranger or not. The were not calling him a Sod Buster.
Strangers never knew if he was a "RANCHER" or not.
Other people asked questions on similar topics, check out the answers they received:
Other people asked questions on various topics, and are still waiting for answer. Would be great if you can take a sec and answer them