Source:
https://scmp.com/magazines/hk-magazine/article/2037594/poison-man HK Magazine
Poison Man
吹水 (chui sui), v. Cantonese slang. To chat, bullshit.
“Dweeb/nerd/geek.”
A socially awkward, unattractive man interested in anime and comics, who is incapable of talking to women.
Sounds similar to duk naam (獨男), “single/lonely man.”