The Prophet ﷺ never used bad language neither a "Fahish nor a Mutafahish. He used to say "The best amongst you are those who have the best manners and character." (See Hadith No. 56 (B) Vol. 8) (Using translation from Bukhārī 3559)
«لَمْ يَكُنْ رَسُولُ اللهِ ﷺ فَاحِشًا وَلَا مُتَفَحِّشًا»
"The best of you are those best in conduct.' And the Prophet was not one who was obscene, nor one who uttered obscenities."
قَالَ رَسُولُ اللَّهِ ﷺ خِيَارُكُمْ أَحَاسِنُكُمْ أَخْلاَقًا وَلَمْ يَكُنِ النَّبِيُّ ﷺ فَاحِشًا وَلاَ مُتَفَحِّشًا
[Machine] I heard the Messenger of Allah ﷺ say, "Indeed, Allah does not like obscenity and vulgarity."
سَمِعْتُ رَسُولَ اللهِ ﷺ يَقُولُ «إِنَّ اللهَ لَا يُحِبُّ الْفَاحِشَ الْمُتَفَحِّشَ»
"لَمْ يَكُنْ رَسُولُ اللهِ ﷺ فَاحِشًا وَلَا مُتَفَحِّشًا، وَلَا صَخَّابًا في الأَسْوَاقِ".