嘿咻嘿咻

heixiuheixiu

This is a slang in Chinese which means "Having sex." Here's my theory of it's origin which might be wrong of course. I think it comes form Shinchan (くれよんしんちゃん[kureyonshinchan]）comic on TV. When Shinchan's parents where doing it in the room. Shinchan ask what they were doing and his mom told her 嘿咻嘿咻[heixiuheixiu], which later adopt a new meaning to mean "having sex." Perhaps, what Shinchan's mom said in Japanese was "ひそひそ[hisohiso]”　which means "Secret" in Japanese.
It sounds similar to me, so I suspect 嘿咻嘿咻[heixiuheixiu] is just a Chinese transliteration of ひそひそ[hisohiso], which is very creative.

ax

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Comments

I don't think that origin is right.
hisohiso is a whispering sound, and doesn't necessarily mean "secret"

taka