"
Can't nothing bring me down
My level's too high
Bring me down
Can't nothing gghdh
[Chorus 2x]
Because I'm happy
Clap along if you feel like a room without a roof
Because I'm happy
Clap along if you feel like happiness is the truth
Because I'm happy
Clap
He is also explaining a certain joy that he feels, and that he wants everyone to join in, forget your worries for just a moment, to clap along, and to just have fun. He is also asking you, "Do you know what happiness is? Do you feel happy? If not, Just sing along, open your heart."