Like dogs, cats can learn the meaning of English words when they hear them enough.
For example, a dog can learn to recognize the word "car," and get excited about driving around town with its tongue flopping in the breeze. To that dog, the definition of "car" is "moving tongue-flapping thing," or something along those lines.
Similarly, cats attach their own unique meanings to words they hear their people say.
Lump recognizes the word "walk." Upon hearing this word, he will usually sprint to the back door, where his leash is hanging, and jingle it insistently until you take him outside.
To Loaf, "treats" used to mean "that time of night when I follow Kelly out of the bathroom into her bedroom, and wait expectantly for her to give me a treat, which I seize, often chomping her fingertips in the process."
However, tonight, a new definition was added. "Treats" is when Kelly sticks her hand out and Loaf bites her fingertips -
whether or not a treat is actually present.
Oh, Loaf...