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)  

لَمْ يَكُنِ النَّبِيُّ ﷺ فَاحِشًا وَلاَ مُتَفَحِّشًا وَكَانَ يَقُولُ إِنَّ مِنْ خِيَارِكُمْ أَحْسَنَكُمْ أَخْلاَقًا  

We were sitting with ʿAbdullah bin ʿAmr who was narrating to us (Hadith): He said, "Messenger of Allah ﷺ was neither a Fahish nor a Mutafahhish, and he used to say, 'The best among you are the best in character (having good manners)."'  

لَمْ يَكُنْ رَسُولُ اللَّهِ ﷺ فَاحِشًا وَلاَ مُتَفَحِّشًا وَإِنَّهُ كَانَ يَقُولُ إِنَّ خِيَارَكُمْ أَحَاسِنُكُمْ أَخْلاَقًا  

"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  

"The best of you are those best in conduct.' And the Prophet was not one who was obscene, nor one who uttered obscenities." (Using translation from Tirmidhī 1975)   

أَنَّ رَسُولَ اللهِ ﷺ لَمْ يَكُ فَاحِشًا وَلَا مُتَفَحِّشًا وَكَانَ يَقُولُ مِنْ خِيَارِكُمْ أَحَاسِنُكُمْأَخْلَاقًا  

[Machine] "Abdullah ibn Amr said, 'Indeed, the Messenger of Allah ﷺ was not obscene nor did he utter obscenities. He used to say, 'The best among you are those with the best manners.'"  

عَبْدُ اللَّهِ بْنُ عَمْرٍو إِنَّ رَسُولَ اللَّهِ ﷺ لَمْ يَكُنْ فَاحِشًا وَلَا مُتَفَاحِشًا وَكَانَ يَقُولُ «خِيَارُكُمْ أَحَاسِنُكُمْ أَخْلَاقًا»  

[Machine] "Abdullah ibn Amr said: 'Indeed, the Messenger of Allah ﷺ was not obscene nor excessively explicit, and he used to say, 'The best among you are those with the best manners.'"  

عَبْدُ اللَّهِ بْنُ عَمْرٍو «إِنَّ رَسُولَ اللَّهِ ﷺ لَمْ يَكُنْ فَاحِشًا وَلَا مُتَفَحِّشًا وَكَانَ يَقُولُ » خِيَارُكُمْ أَحَاسِنُكُمْ أَخْلَاقًا «