Ba (or 3) + name
It's like you're giving someone the worst nickname ever. You take 'Ba' and stick it to their name like they're a lost dog who just ate a shoe.
Ba Geng, you're so clueless, you think a keyboard is a plate.
Ba Bong, you're like a broken clock that's also confused.
Ba Zven, you're slower than a turtle with a head cold.