Definition of chat verb from the Oxford Advanced American Dictionary

      

    chat

     verb
    verb
    NAmE//tʃæt//
     
    Verb Forms present simple I / you / we / they chat
     
    he / she / it chats
     
    past simple chatted
     
    -ing form chatting
     
     
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  1. 1[intransitive] to talk in a friendly, informal way to someone chat (to/with somebody) My kids spend hours chatting on the phone to their friends. chat away (to/with somebody) Within minutes of being introduced they were chatting away like old friends. chat about something/somebody What were you chatting about?
  2. 2[intransitive] chat (away) (to/with somebody) chat (about something/somebody) to exchange messages with other people on the Internet, especially in a chat room He's been on the computer all morning, chatting with his friends.
See the Oxford Advanced Learner's Dictionary entry: chat