Danny, your #341. Afraid I've no idea where Samson's Missy-Sahib variation crept in from, but he made it into a charming and certainly a respectful term of address.
I took him to the beach once, at Thandwe (Sandoway) in Arakan. Your territory, and not much changed since you were there I imagine. Samson had never seen the sea before. Lent him some bathers, a smallish wave rolls in and tumbles him over, he comes up spluttering but grinning. "Sah, this water is very strong!"