- The definition of beddy bye is an expression that means going to sleep or going to bed that is usually used with kids.
An example of beddy bye is putting your child down to sleep in his crib for the night.
This baby has gone beddy bye.
bed or bedtime: orig. a nursery word, now facetious
Used to say good night to someone, especially to a child, who is going to bed.
The act of going to bed or of putting a child to bed: It's time for beddy-bye.
- (idiomatic, baby-talk, childish) Bedtime for a toddler, going to sleep, going to bed.