卧槽
Wò cáo
"卧槽" means lying but generally, it is used as a bad word. Interestingly, different tones when you pronounce the word can have different meanings!
For instance,
1 . 卧槽 （ wǒ cáo) with the third tone and the second tone would mean: " what???" (with a tint of confusion)
2.卧槽 （wò cào） where both are the fourth tone would mean: "OMG!! Unbelievable!"
3. 卧槽 （wo cào）with no tone and the fourth tone would mean: "thats amazing!" in a complimentary way
4. 卧槽 （wò cao）the forth tone and no tone would mean: " daaamn ! You scared me !! "
5.卧槽 （ wō cāo ）where both are the first tone would mean a kind of contempt or scorn
so 卧槽 is not only a pejorative term , it also can be a commendatory term in some situations