The word has a couple of meanings depending on the context in which it is used:

1. It is used to refer to a big butt.
2. It is a word used to refer to a lunch box or food that you are carrying with you.

Toga Ke ja mopako wa kamoso 😩.. I’m so hungry

— Tebogo Seganabeng (@tebby__s) 5 September 2019