Fackhead - A fackhead is someone who thinks they're important but they'

A fackhead is someone who thinks they're important but they're just a loud mouth.

My teacher called me a fackhead for talking too much during the test.

My friend's parrot said I was a fackhead for forgetting my lunch.

My brother said I was a fackhead because I didn't know what a "trombone" was.