We found one dictionary that defines the word flat-hatter:

General (1 matching dictionary)

1. flat-hatter: Merriam-Webster

(Note: See flat-hat as well.)

Definitions from WordNet (flat-hat) ▸ verb:  fly very close to the ground ▸ Also see flat-hat ▸ Words similar to flat-hatter ▸ Usage examples for flat-hatter ▸ Idioms related to flat-hatter ▸ Wikipedia articles (New!) ▸ Words that often appear near flat-hatter ▸ Rhymes of flat-hatter ▸ Invented words related to flat-hatter