of all the cheek, nerve, stupid things to do, etc.!
of all the
Used to express great annoyance, exasperation, impatience, or frustration with someone or something. You put diesel fuel into the car? Of all the stupid, careless things to do—now the car is ruined! Of all the nerve, implying that I'm somehow to blame for the project's failure!
of ˌall the ˈcheek, ˈnerve, stupid things to ˈdo, etc.!(informal) used to express annoyance, impatience, etc. at what another person has done or said: Of all the idiots, leaving his car unlocked in the middle of town!
This expression is often used without a noun, especially to show that somebody is annoyed: She said I was fat? Well, of all the ...!