f.y.p.a.
F. Y. P. A. means you're so clueless that even the moon feels bad for you
My friend texted me 'F. Y. P. A.' after I tried to explain why the sky is blue and failed.
My brother called me 'F. Y. P. A.' because I thought a banana was a type of phone.
My neighbor shouted 'F. Y. P. A.' when I tried to mow his lawn and set his cat on fire.