Make it plain, neutral and simple.
"Please don't talk to me right now. I am very busy."
If that person were me, and I can easily relate, I would leave.
oddly I can be chatty myself.. though I tend to be chatty about my interest focus, which is Role playing (like Dungeons & Dragons and other such stuff)
I know more then a few NT's with this interest, luckally for me, the rest of the time I try to shut up so I don't seem weird.
I don't have much trouble dealing with chattery folks.. something that can really put them off is if you start chattering back. Especially if you have an interest focus that's a little left of centre or 'dull' even chatteres can get bored.
Cross your arms, look at your watch, tap your foot, look around the room, hands on hips, sigh, etc.
Ha! I call it "Chasing the Rabbit" after Aristotle's comment. He was notorious for it. I chat in nigh unstoppable bursts interspersed with hours of silence.
I tend to be suspicious of other women continually chatting at me for one reason. Unfortunately sometimes my autieness looks like I'm a lesbian so I have to deflect some well-meaning but unwanted affection.
Lol, afraid I make it perfectly clear if someone is invading my space.. I totally ignore them and walk off generally, or I swear..rude as that may be. I just cannot abide anyone coming near when I am not wanting to hear human noise.
He definatly wasn't on the spectrum. He was far too stupid and social. Your typical loudmouth NT. In the end he started telling people to stay away from me because I was weird. I'm glad I got sacked.
There's been plenty of times I've wanted to tell somebody to please stop with their story; usually because the subject matter makes me uncomfortable.
In these instances, I change the subject.
I've also noticed if I'm talking, I skip from subject to subject as one thing reminds me of another. Some people can't catch up with these flights of thought.
If only I had a way to get away from people, my solution is to go to sleep... or to leave, but thats really hard to do if those people are you parents...
People that just talk and pretend to be evryones best mate really annoy the crap out of me as it is so fake and ungenuine. i like people to be honest and that way if they talk to me it's because I know they want to. Otherwise just say hello and leave it at that.
And it makes you think, are friends like that really worth it... I have had only 3 people that I really considered friends lives in a different city and I haven't kept in touch, the other lives in the same city but I see her often, and the third lives a bit farther away in an ajacent city and I see him very often
I have neevr really maintained contact with anyone who i knew from school which is a shame.
Only the one I haven't remained in contact with is the one I know from school... Part of it is because he had some friends that picked on me constantly...