It deals with Excite's Super Chat program:
What are these Gestures people keep playing?
Gestures are .vpa files of animations with sound that are displayed to the room in your chat bubble. The new Super Chat Beta installs with default gestures that are ready to play and can be seen by anyone with the newest Beta build.
Users can also create their own gestures to share with friends. To view a user created gesture, you need save the actual .vpa file to your gesture folder. If a gesture is played that you do not yet have saved, you'll see the Gesture tag line in your room text, but not the animation or the sound.
Please Note: You should only accept files from people you know and trust. While most gestures are made for fun and entertainment, be aware that files accepted online can be corrupt or contain malicious programs.
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