This is the 143rd most frequent Afrikaans word.
jong
"Jong" means "young" or is used informally to express surprise or emphasis, similar to "man" or "mate" in English.
The word 'jong' here is used as an adjective meaning 'young', describing the age of the boy.
Die jong seun speel in die park.
The young boy is playing in the park.
The word 'jong' in this context is used as a nominal form, addressing someone in an informal manner, akin to 'lad' or 'youngster'.
Jong, jy moet jou werk doen.
Youngster, you must do your work.
Here, 'jong' is used as an interjection, expressing surprise or emphasis, similar to 'wow' or 'man'.