A ridiculous, silly or stupid person.
The word 'dingbat' originally refers to to a character or symbol used in typesetting which gives an instruction to the printer. These should be removed before the text is published, but were occasionally left in by
mistake. The character made no sense to
non-typesetters and the association of "dingbat" with "nonsense" and "forgetfulness" carried over to describe
people.
Julia's such a dingbat, I asked her to buy me
yogurt and she got me cream.
This end of year report is riddled with inaccuracies. Looks like we've got a dingbat in the mix.
(sarchastic) Nice one
Paul, a spectacular display of
ding-battery.