It literally means scolding someone's mother for her deviant behavior. But it's actually just a swear word, and no one will think it's so dirty.

The fact that "hippie" is a very old language seems to mean that two horses mate. Some people say that people should "play with horses" because "playing" is an extension of flirting. I can't prove this, but "horse" is related to horses, such as two horses and three horsepower. I don't need to say the original meaning of "Niang Xipi", but now it is extended to swear words, and it is a very vulgar and ugly word, a bit like "Fuck Niang B" said by northerners.