Definition from Wiktionary, the free dictionary
Alternative forms 
oaf (plural oafs)
- (obsolete) An elf's child; a changeling left by fairies or goblins, hence, a deformed or foolish child.
- (pejorative) A person, especially a large male, who is clumsy or a simpleton; an idiot.
- Ouch! You dropped that box on my feet, you lumbering oaf!
Derived terms