No, I definitely meant boulder. It comes from the Cantonese 'si tsing waak yi mou, tou sou nang goek nga.'
In nature, [poetic] grace in many cultures is often accredited to trees, leaves, hills, grass, water, and so on; anything that flows or sways - rarely, if ever, a boulder. The expression conveys that the style of speech used, while somewhat able to be followed, lacks in rhythm, flow and general idyllic appeal.

That's as maybe; however, since you were grumbling about the other blokes bad English, I'd say that that 'si tsing waaky boulder' looked a bit incongruous and should not have been cluttering up the English landscape...........unless of course you were sarcastically implying that the pretend native English speaker was as intrusive as the si sing waaky boulder- then we could find a place for that rock. Am I right or am I right?