Scottish usage:
a) Someone who (sometimes unwittingly) by speech or
action demonstrates a lack of
knowledge or misconception of a particular subject or situation to the amusement of others.
b) A good humoured admonition, a term of endearment
c) A reckless, absent minded or unwise person
a) "No. That wisnae
wit she meant, ya
big numpty!"
b) i.e. "Silly billy", "You
big dafty"
c) "That numpty's driving with no lights on!"