also: グッドアイディア
noun
A direct loan from English, used in casual conversation to praise a suggestion or plan. Often used as an exclamation.
それ、グッドアイデアだね!
That's a good idea!
週末にピクニックに行くなんてグッドアイデアだ。
Going on a picnic this weekend is a good idea.
Borrowed from English 'good idea'.