Japanese phrase
指切りしよう。 yubi ki ri shi yō
Meaning
Let's make a pinky promise.
When to use it
Suggests making a promise by linking pinky fingers. It sounds friendly and childlike, and often confirms a promise between friends.
Example dialogue
明日いっしょに遊べる？ asu i ssho ni aso be ru
Can you play with me tomorrow?
うん、指切りしよう。 u n yubi ki ri shi yō
Sure, let's make a pinky promise.