wacky idea

Translations
сумасшедшая идея
He had a wacky idea to start a business selling pet rocks.
У него была сумасшедшая идея начать бизнес по продаже камней-питомцев.
Definitions
A wacky idea refers to a concept or suggestion that is unconventional, eccentric, or absurd, often characterized by humor or a lack of seriousness.