嘘うそから出でたまこと

expression, noun

lie that turns out to be true; something said as a joke that comes true

Refers to a statement originally made as a lie or joke that unexpectedly becomes reality. Often used in a lighthearted or ironic context.

• 冗じょう談だんで言いったことが嘘うそから出でたまことになった。

  What I said as a joke turned out to be true.

• 彼かれの予よ言げんは嘘うそから出でたまことだった。

  His prediction, which was meant as a lie, came true.