吹水 (chui sui), v. Cantonese slang. To chat, bullshit.
PUBLISHED : Thursday, 28 January, 2016, 12:25pm
UPDATED : Wednesday, 19 October, 2016, 4:55pm
“To chat someone up out of the blue.”
Presumably so named because chat-up lines (romantic or otherwise) put you in an awkward spot, exposing yourself to ridicule.