Nabei
It’s like saying ‘fuck’ but when you add ‘knnccb’ it means ‘fuck your mom and her stinky taco’, it’s the ultimate insult for anyone who dares to talk trash.
My homie just said ‘knnccb’ after I called his mom a taco.
At lunch, I told my enemy ‘knnccb’ and he cried.
When my cousin said I was ugly, I said ‘knnccb’ and he ran away.