Well TT is what the Vietnamese said and what we picked up from them. I am aware of the French influence. That is why it was very helpful to have a French speaking person in our unit. By the way, "TT" (or however it is spelled", simply means something along the lines of "just a minute". When asked to do something, but you are busy with something else, you might have relied "TT" if you were in Vietnam and that might have been common usage where you were. It is not the same as "di di mau".
I am somewhat surprised at the pushback and questioning of some of the things I have said in this thread. Oh well. Such is life in forums.
Tony