OAF, noun [said to be a corruption of ouph or elf, a fairy or demon, and to denote a foolish child left by fairies in the place of one of better intellects which they steal.] 1. A changeling; a foolish child left by fairies in the place of another. 2. A dolt; an idiot; a blockhead.
Source: Webster's 1828 American Dictionary ↗ · public-domain · returned verbatim, no AI