1.
If someone says that they will be ~ if they will do something, they mean that they do not want to do it and they will definitely not do it. (BRIT INFORMAL, RUDE)
ADJ: v-link ADJ emphasis
2.
If someone says that they are ~, they mean that they are very tired. (BRIT INFORMAL, RUDE)
ADJ: v-link ADJ
3.
If someone says that something is ~, they mean that it is completely ruined or broken. (BRIT INFORMAL, RUDE)
ADJ: usu v-link ADJ