Really? Even with my rudimentary school boy French I have always known that Mayday= m'aidez="help me".
But what if I don't want help, or if there is nothing anyone can do to help. I just want to let ATC know I'm going to ignore any of their instructions and please shut up and let me sort out the problem as best I can. When landing out in a glider I always announced position and intentions then turned the radio off. There was nothing anyone could do to help.