Source:
https://scmp.com/magazines/hk-magazine/article/2037591/i-poke-your-lung HK Magazine
I Poke Your Lung
吹水 (chui sui), v. Cantonese slang. To chat, bullshit.
“Screw you.”
Conjures up images of poking someone in the chest; fai may originate as a euphemism for female genitalia.
Now a fairly mild, old-fashioned expression, often shortened to “ding” to express frustration or irritation.