This is the 530th most frequent Danish word.
fuld
"Fuld" in Danish means "full" or "drunk," depending on context.
Here, 'fuld' means 'full' in the sense of containing an abundance of something, in this case, joy.
Han var fuld af glæde på sin fødselsdag.
He was full of joy on his birthday.
In this sentence, 'fuld' again means 'full', used to describe a container completely filled with a substance, which is water here.
Glasset er fuld af vand.
The glass is full of water.
Here, 'fuld' is used in the sense of being intoxicated by alcohol.