Nor should there be obscenity, foolish talk, or crude joking, which are out of character, but rather thanksgiving.
4. Neither filthiness. To those three — other three are now added. By filthiness I understand all that is indecent or inconsistent with the modesty of the godly. By foolish talking I understand conversations that are either unprofitably or wickedly foolish; and as it frequently happens that idle talk is concealed under the garb of jesting or wit, he expressly mentions pleasantry, — which is...
These verses contain a caution against all manner of uncleanness, with proper remedies and arguments proposed: some further cautions are added, and other duties recommended. Filthy lusts must be suppressed, in order to the supporting of holy love. Walk in love, and shun fornication and all uncleanness. Fornication is folly committed between unmarried persons. All uncleanness includes all other sorts of filthy lusts, which were too common among the Gentiles.
Commenting on Ephesians 5:3-20
Neither filthiness, nor foolish talking, nor jesting,.... The former of these may include all filthy gestures and behaviour, every indecent habit and attire, and all actions which have a tendency to excite lust; and also all impure words, these discover an impure heart, and are the means of corrupting men's minds and manners; filthy speaking, is a verbal commission of the things that are spoken...