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1. One who is stupid or foolish. Geez, he keeps pulling on a door that's clearly marked "push"—what a dingbat.
2. A name for a small gadget whose actual name has, typically, been forgotten. Where's that dingbat? I need it to finish this repair.
1. n. a name for a gadget. Isn’t there supposed to be a little red dingbat that goes in this hole?
2. n. a stupid person. Who is the dingbat with Bob?
3. n. any undesirable person. (Also a rude term of address.) I’m tired of reading about that dingbat in the paper every day.