1.someone who doesn't care about anything.
if someone does not care about others and even his own things, he/she can be called 'what-me-worry friend',or also he can say "what? me worry?"
2. here's my what-me-worry friend, John. he's already been sleeping for 12
3. What, me worry?: how to hang in when your problems stress you out (Book title)
4. you are really what me worry guy