a stupid, unpleasant or awkward person, especially a man Mind that cup, you clumsy oaf! He stood there grinning like an oaf. See related entries: Stupid Word Origin early 17th cent.: variant of obsolete auf, from Old Norse álfr
‘elf’. The original meaning was ‘elf's child, changeling’, later ‘idiot child’ and ‘halfwit’, generalized in the current sense.