I have found that I become very frank, open and honest while on Meth. I am sure that some people may find that annoying depending on what you are honest with them about, they may not want to hear it.
My husband and I have great talks while tweeking. It is one of my favorite parts of the experience!
It will make you ramble though. Kind of funny if you ask me. For example you can talk for about 15 mins and then look at the person you are talking to and bust out laughing and say " did any of that make sense"? And depending on if they are tweeking too they will either laugh also, say yes it all made perfect sense or look at you like you are crazy. No matter what, you are having fun, right??