Owening

The act of using a chat's reply button to shove together replies to several previous messages into one very long message. The term was coined by Silas Miller, after Owen Behrens repeatedly did this very thing.

As far as I know, Teams is the only platform that allows you to do this. In Teams, replies to messages are treated as chunks of text, while in other platforms (Google Chats, Discord, etc.) they are a property of the message itself. This means that on all other platforms that I know of, you can only reply to one message at a time using the built-in reply feature.

Some time after the term was coined, Anna Haagenson claimed it should have been named after her instead. She allegedly did it before Owen did, and thus she wanted it to be named after her. However, she's the only one who holds this position. If you see Anna use the word, that's what it means.