smut

noun
1
stories, pictures or comments about sex that deal with it in a way that some people find offensive
هرزه‌نگاری, مطالب مبتذل, ادبیات مستهجن, آثار شهوانی, تصاویر غیراخلاقی
2
dirt, ash, etc. that causes a black mark on something; a black mark made by this
دوده, لکه سیاه
His face was covered with smuts from the engine.