I think it's one of the things St. Paul condemns. What you are describing is vulgarity, St. Paul calls it "Scurrility." Scurrility is smutty conversations and jokes, where people reference obscene or sinful things, (usually sɛҳuąƖ) without actually saying what is meant, but everyone knows what is really meant. St. Paul tells us to have nothing to do with that.

Eph 5:1 Be ye therefore followers of God, as most dear children;  2 And walk in love, as Christ also hath loved us, and hath delivered himself for us, an oblation and a sacrifice to God for an odour of sweetness.  3 But fornication, and all uncleanness, or covetousness, let it not so much as be named among you, as becometh saints:  4 Or obscenity, or foolish talking, or scurrility, which is to no purpose; but rather giving of thanks.  5 For know you this and understand, that no fornicator, or unclean, or covetous person (which is a serving of idols), hath inheritance in the kingdom of Christ and of God.

I'm guessing scurrility covers foul language like the N word? Is negro also an N word?