a) A stuffed animal, blanket, or toy that a small child is more attached to than any other, and often sleeps with.
He can have his litterbox, his carpet, his toys, and space to do a little binky in there even.
[ page 81]: As he got to know Susan (and her food), he sometimes raced around on the grass when he saw her arrive, or leapt into the air, kicking his hind feet above him, then shaking his head goofily after he landed. This is the “shimmy” that Southern noticed, or the “frisk” that Lockley described. Among domestic rabbits, it’s referred to as a “bunny dance” by some and a “binky” by others. It looks sort of like an epileptic fit—but it’s an unmistakable gesture of joy.
Wikipedia foundation.