Definition of lighty in English:

lighty

(also laaitie, litie)

nounlighties

South African informal
  • A boy or young male adult.

    ‘‘This lighty (little one) called Mnisi will taste my power come April 5,’ he said amid deafening applause from a packed hall.’
    child, baby, infant, son, daughter, youngster, little one, tot, tiny tot

Origin

Apparently from the adjective light from light of heart+ -y; the variant laaitie shows Afrikaans influence.

Pronunciation

lighty

/ˈlʌɪti/