These taunts can be used to influence the behavior of computer players. You only have to type the number for it to work. Make sure to send the chat to the correct AI player. To make sure you are sending it to the correct computer player, click on the trumpet icon at the top-right of the screen. From there, make sure that the box is ticked for the computer player that should receive your message.
These are ones that new AI in the HD Edition on Steam is able to respond to (some custom AIs for the UserPatch also use these taunts). These are subject to change as long as the HD Edition remains in active development. There are currently no official audio files in the game for these taunts.