The definition of a ditz is slang for someone who is silly or who seems to have scattered thinking.
An example of ditz is a silly dumb person who just giggles all day.
Slang a person thought of as being flighty, eccentric, silly, etc.
Origin of ditzback-formation ; from ditsy
A scatterbrained or eccentric person.
Origin of ditzBack-formation from ditzy.
- (informal) A scatterbrained person, especially a woman.
Back-formation from ditzy.