Definitions
pfunde: sorghum plant
hanga: guinea-fowl
Translation
A senior is senior; a guinea fowl does not perch on a sorghum stalk.
Inspiration
A sorghum stalk cannot support the weight of a bird as large as the guinea fowl, hence the bird will not perch on it.
Application
One in a position of authority is expected to act in a dignified manner, in line with the standard of the position. That way, due respect will be given.