What does dela dela ngyanya dela dela sondela mama sondela from the song Dela by Johnny Clegg mean?

Well, honey, that gibberish actually means "go away, go away, old man go away, come back, mama come back" in Zulu. So, next time you're belting out those lyrics, just remember you're telling an old man to scram and begging your mama to come back. Rock on, darling!