I had no idea either of us were on the spectrum at the time but looking back on it, my girlfriend was almost definitely an Aspie.
She used to say "mew" some times, kind of like a cat's meow especially when she was having one of those sigh that's kind of depressing moments, but addressing it in a playful way.
She also used to stand completely pigeon toed, rise up on the balls of her feet, give a huge grin, flap her arms and say "flap flap" when she was happy.
My cats b***h and moan with pathetic long meows all the time so I imitate them and meow back.