Lwazi means 'Rock' in Luganda: He's basically talking about how 'their' love is; so strong, will never fade, and, will forever, last for so long regardless of what they've been through, and what people talk..Not even a storm will sweep away what they've built together for it is for eternity. The lyrics on this one are so deep!
To add more; he sings in the chorus that their is/was planted in the rock and no storm can uproot it... He says in the first verse,let me thank you even though i he doesnt do often. He is still undeniably an extraordinary act! And i promise you more music is still coming