A set of fonts showing pictures instad of letters.
I was talking to your best friend, he told me your were in on holiday, he is a real dingbat isn't he.
I tried to cash my wifes paycheck, I felt like a dingbat when they refused me because of my sex.
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.
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.