What is a flaky derelict?

The Word "flaky" means literally covered in flakes, like the skin of someone with dandruff. Its extended meaning refers to someone who is erratic and eccentric and generally unreliable. A derelict means literally something which is abandoned and decaying, especially a building or ship. But it is also used to refer to people who are bums, vagrants, or other homeless types, who have been abandoned by society and who are decaying.