Nabonga
When you run into someone you think is the dumbest person alive but you don't wanna say it to their face so you say 'Nabonga' and act like you're the one who's weird, but really you're calling them a brainless donkey.
My teacher asked me why I drew a cat on my math test. I said 'Nabonga' and walked out.
My cousin called me a 'silly goose' and I replied with 'Nabonga' and walked away like I was king.
At the grocery store, the guy behind me said 'Nabonga' to the person who spilled milk on the floor.