Direct translation: Bore me again
It is a sarcastic way of telling someone that they are irritating you or boring you.
The word can also be used in a light hearted way way to tell someone that they are being silly but funny.
Constantly saying "weitsi bana ba today" 🙄 MBORE GAPE
— The rising underdog 🙇🏿♀️ (@Lesa_Tsele) August 12, 2019