I don't talk because speech is almost totally disconnected from my thoughts, and because most of the time even the disconnected speech isn't possible. I can either be very quiet or very chattery using typing though which is what I use to communicate in person.
During the times when speech happens (but in a way that has nothing to do with my thoughts) I deliberately suppress it where possible because it would just confuse people. Most of it is either repetitions of things I have read or heard, literal reading of something in front of me (even if I have no conscious awareness of it), or these weird strings of words that are like.... "bister bister baster b*tch" to pick one of the more amusing ones, or just repetition of a single word with different inflection, vowel sounds, stress, or accent. Or a variety of non-word sounds (squealing, meowing, staccato yelling, etc.) The meowing happens in front of other people sometimes...well so does most of it, I just try to keep it to myself because it's just weird stuff.
(I've noticed sometimes the weird stuff has relevance to the situation, but it's... tangential at best and I can't control for obscenity or lack thereof.)
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"In my world it's a place of patterns and feel. In my world it's a haven for what is real. It's my world, nobody can steal it, but people like me, we live in the shadows." -Donna Williams