The other day, someone quoted Ephesians 5 at me:
3 But among you there must not be even a hint of sexual immorality, or of any kind of impurity, or of greed, because these are improper for God’s holy people. 4 Nor should there be obscenity, foolish talk or coarse joking, which are out of place, but rather thanksgiving.
If I understand her properly, she took this to mean that it is wrong to use coarse language in general, and she's probably right about this. Mea culpa. (I'm working on it: just the other day, I heard myself using "Sam-I-am" as an expletive, as in, "Sam-I-am, this chili is spicy!" This strikes me as more weird than virtuous, but I guess it's an improvement.)