The Vietnamese word "đi đái" is a colloquial expression that means "to urinate" or "to pee." It is a casual way to refer to the act of making water.
While "đi đái" is informal, you might encounter the phrase used in a more humorous or light-hearted context. For example: - "Trời ơi, mình uống nhiều nước quá, mình phải đi đái ngay!" (Oh my, I drank too much water; I have to pee right now!)