What's the origin of the Hong Kong colloquialism "I go to school by bus"? I've seen this phrase being used frequently on social media amongst the youth of Hong Kong.

I go to school by bus

Would anyone kindly explain how this phrase came to be and what it means?
From my understanding it's the result of deliberately transliterating the original Chinese phrase in a mocking manner, but I could be wrong. Thanks for your help!
It was a troll response commonly used in the Hong Kong Online Forum "HKGolden". The line was originally from a Primary School Textbook's dialogue and was usually being used as a ridiculous and nonsense reply to English-related questions on the forum. 

Check here for the Hong Kong Local Encyclopedia page on this phrase.