It is the seed of the umya.
More Xhosa Proverbs:
You drink out of the old cup.Xhosa
The shield turned the wrong way.
Xhosa
The foot has no nose.
Xhosa
They have slaughtered at Kukwane where much meat is obtainable.
Xhosa
Like the marriage feast of Mapassa.
Xhosa
They prevent us from getting red clay from the pit, and they do not use it.
Xhosa