In the game the glory of the king, "dd" is usually the abbreviation of Didi, which means driving in groups and chatting privately with friends. In the chat room or chat interface of the game, "dd" is an invitation to drive in groups, which is short for Didi; When "dd" is used to refer to other players, it usually means that the player is a younger brother with poor skills.
The above information is for reference only. For more information, please consult official website or senior players.