The word has a couple of meanings depending on the context in which it is used.
1. It can be used to refer to a fart.
‘Daai man o shapile bomb.’
2. It can also be used to refer to ignoring someone.
I sent this one a text in the morning yaz,ong shapile ka bomb kere le nou😂 obvs watseba ke batla chelete 😂😂😂
— pumpkin. (@minnie_luu) November 23, 2017