A load of bullshit. If someone is using scheissery they are usually trying to “pull the wool” over you or fool you for the clown you are. If they are using scheissery then you know they are lying and/or coming up with dumb excuses to try and bamboozle you.
Cut the scheissery. I know you’re a fraud and a lying snake
In this context, "scheisse" is used to describe a negative or unfortunate experience that warrants a one-line response but does not warrant hard swearing.
"Scheisse" is commonly used in an environment where English is the main language and swearing would be inappropriate e.g. around a younger audience.
Person 1: "Hey, good news is I found the problem. Bad news is I can't fix it."
Person 2: "Scheisse."