When quizzical, I will often emit a somewhat "mew" sound
After a carnal act, I am known to purr (and during to occasionally nip and claw lightly; not for pain, just for passion)
But most of my acts are non-verbal. Crouching on furniture, pouncing, climbing stairs on all fours, walking on the balls of my feet, catlike stretching, sleeping on floors, eating foods w/o aid of utensil or plate (i.e. tuna from a can or leftover meatloaf with my hands), I also enjoy slight licking on another's nose or behind the ear.