1.
street language, slang
Don't use street language in class. مَاتِسْتَعْمَلْشْ لُغِةْ شَارِعْ فِالكْلَاسْ matista3malch loughit chari3 filklas
2.
colloquial language
A lot of people only know colloquial language, while standard Arabic is hard for them. برشة عباد يفهمو كان لغة الشارع أما العربية الفصحي صعيبة عليهم brch 3bd yfhmw kn lgh chr3 2m l3rby lfs7y s3yb 3lyhm