This slang means: “It shouldn’t be this way. Also, you can use this slang to express disapproval.
Here is a real-life example to show you how to use this slang:
“مينفعش كدة ياكريم صوتك عالي قوي، وطي صوتك شوية”
“Hey, Kareem! You’re so loud, lower your voice a bit.”
Be careful when you use this slang, as it could be offensive. Use it with friends, and avoid using it with family members you consider to be your elders such as your parents.
I hope it helps you, please leave a comment if you have any questions!