premature posting

To accidentally post a reply/comment before finishing your thought, leading to subsequent additional posts to explain the oddness of the original incomplete partial, or premature post.

Cathy: "I saw that scary movie last night, it was as creepy as you said it would be."
Terry: "I never saw anything
Cathy: ??
Terry: "so scary in my life, gaaaah!!! sorry I'm always premature posting!"
Cathy: "yeah I do that all the time."