Direct translation: This person here

It is used to express shock is a persons actions.

The phrase is usually followed by a shocking revelation.

Motho shu put garlic in my eggs. Why?? 🥲 Euyww

— Baby ghurl 🤎 (@Bathong_Baby) December 1, 2021

Motho shu ong sekisaphone yaka le dumpie yaka.
He’s 2 y.o

— Nox Mahlangu (@The_NOXman) July 18, 2019