A good old southern question asked of someone with a foul mouth. In fact, in the first reading today St. James gives one of the harshest descriptions possible of the mouth. We often uses the worse cursing to refer to a list of "bad words." He goes much further in his notion of what constitutes foul language.
Not many of you should become teachers, my brothers and sisters,
for you realize that we will be judged more strictly...
In the same way the tongue is a small member
and yet has great pretensions.
Consider how small a fire can set a huge forest ablaze.
The tongue is also a fire.
It exists among our members as a world of malice,
defiling the whole body
and setting the entire course of our lives on fire,
itself set on fire by Gehenna.
For every kind of beast and bird, of reptile and sea creature,
can be tamed and has been tamed by the human species,
but no man can tame the tongue.
It is a restless evil, full of deadly poison.
With it we bless the Lord and Father,
and with it we curse men
who are made in the likeness of God.
From the same mouth come blessing and cursing.
My brothers and sisters, this need not be so.