Tweet Fail
When someone writes a tweet about someone else. The person writing the tweet doesn't know that the other person is following them.
Jill: I can't believe I kissed Bob last night, he's such a creepy asshole.
Bob: @Jill Did you forget that I was following you? Bitch.
Follower of both people: @Jill Haha! Tweet fail!
Bob: @Jill Did you forget that I was following you? Bitch.
Follower of both people: @Jill Haha! Tweet fail!