A playful, baby-talk word you say to a dog to tell it you are taking it out for a walk. It is almost always said on its own, in a bright happy voice: "Walkies!" The dog does not understand English, of course — it learns the sound and gets excited. This is very much British English; Americans are more likely to say "Wanna go for a walk?" or just "Walk!" You can also say a dog "needs walkies" or that it is "time for walkies", but it stays childish and warm — you would never use it in serious writing, and you would not use it about a person going for a walk. It looks plural because of the -s, but it is not really a plural of anything; the -s here is the same friendly ending you hear in other British nursery words. Some people also use it jokingly about themselves or a friend, the way you might joke about taking a person out like a pet — that is a joke, and it lands as a joke.

（對狗說的）散步囉、遛狗、去散步；帶狗出去走走