Genidiot

genidiot

(jen-id-E-ot): n., a person with the interesting trait of being both a genius and an idiot. See also: absent minded.

genidiocy

(jen-id-E-O-cE): n., the act of doing something rather intelligent followed immediately by doing something completely dumb.

origin:

The term genidiot was coined by my spouse after one of my many incidents of genidiocy. Thus, I am the original Genidiot, though there are lots of genidiots out there!