Yes, that sounds familiar. It is part of a traditional Shona detembo/chidawo. The opening is commonly recited as:

Machuma Machena,
Washe mukuru vambwa,
Hwai yomuchena,
Isingasvibiswe neguruva...

After that, there are different versions depending on the family, clan, or region. Like many Shona praise poems and nhetembo, the wording is not standardized and is often passed down orally, so there isn't a single authoritative text.

If you're looking for the exact version that starts with "Machuma Machena, Washe mukuru vambwa, Hwai...", I can help identify it if you tell me:

• which school you lea ed it at,
• the district or province, or
• another line you remember after "Hwai...".

With one or two more lines, I can usually reconstruct the full traditional recitation.