Whisper

From Toontown Rewritten Wiki

A whisper is when a message can be sent to another Toon who is added as a friend without having to be in the same zone or district. Text whispers are indicated by a blue speech bubble and animation whispers are indicated by an orange speech bubble. Should Toons have whispers disabled in the Options menu, they cannot receive whispers.

To send a whisper, click on a Toon's name to open their panel; the third button going down on the panel is to whisper, so click the button then type or select a phrase from the SpeedChat menu. To quickly reply to another Toon's whisper, click the whisper being sent.