I am not quite sure now if I have seen someone wearing a shirt with that warning, but I am looking now at a picture where someone is wearing a shirt with those words.
Why do I pay attention?
Because the Bible says in Ecclesiastes 5:2:
“Do not be quick with your mouth, …”
And in Proverbs 13:3 we are told:
“He who guards his lips guards his soul, but he who speaks rashly will come to ruin.” To speak rashly means of course to speak without due thought.
I hope this is also a serious warning for you.
Proverbs 10:19 says that wise people hold their tongues.
If we don’t want to come to ruin we hold our tongues.