My strangest "stim" was the habit of literally sucking on my tongue. I did this all the time from the ages of 6 to 11. It took 5 years of my parents constantly correcting me to get me to stop. My boyfriend says I still do it in my sleep sometimes.
Now I just play with my hair all the time, rock back and forth, bounce my feet, and pick at my nails constantly.
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Mew mew mew, mew mew mew mew? Mew. Mew mew mew mew, mew. Mew mew, mew. Mew!