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