The "nah badda mi" might work after they got up off the ground from laughing at it coming from CosmicMoose.The "nah go mas" is not something that a tourist should say to a Jamaican anyways. "mas" is "master" and it is usually used by a Jamaican talking to his boss or to a slave owner. Where I live, it would usually be "nah go bossy" if a Jamaican were telling me he wouldn't go somewhere.
"bredda" is a better word. Referring to someone as "brother" or I sometimes use "king" as it shows respect at the same time.
Patois is different all over Jamaica but if you don't know for sure what you are saying it is better to just use English (which they all understand) or not say anything at all and just use hand gestures.
My opinion only.