Most likely the final negatory answer you get after saying "Please" two or three times in a row. It's better to just give up, because when you hear this, whatever you want is not gonna happen.
Synonyms for not gonna happen
On this page, you will find 30 slang terms related to not gonna happen. Some of the top words include: shine it, bleh, jitterness, nofukinway, thrice, and 25 more.