Ephesians 4:29 commands no unwholesome talk. James 3 addresses the tongue. Using God's name carelessly violates the third commandment. Scripture calls Christians to speech that builds up. 45/100 Caution.
Ephesians 4:29 provides the clearest framework: "Do not let any unwholesome talk come out of your mouths, but only what is helpful for building others up according to their needs." This is not a list of prohibited words — it is a principle about the purpose and effect of speech. Speech that tears down rather than builds up is the concern. James 3:9-10 addresses the inconsistency of using the tongue for both worship and cursing: "My brothers and sisters, this should not be."
"You shall not misuse the name of the Lord your God" (Exodus 20:7) specifically addresses taking God's name "in vain." "GD," "OMG," and similar expressions directly violate this command. This is more clearly sinful than general profanity — it is using the name of God without reverence.
The specific words considered "swear words" vary by culture and time — what is taboo is partly socially constructed. Christians should think principally about the effect and character of their speech rather than maintaining a list of prohibited words. Speech that is crude, degrading, sexually explicit, or disrespectful toward people made in God's image is the concern — regardless of whether specific words appear on any cultural profanity list. See Is Lying a Sin? for the broader biblical truth-telling framework.
For more biblical resources on speech: Desiring God on speech.
For the related question of whether drinking is sinful, see our guide Is Drinking Alcohol a Sin? and our broader Is It a Sin? hub.
Questions about sin fall into two categories: things explicitly called sin in Scripture, and disputable matters (Romans 14-15) where Christians with different convictions should respect each other's consciences. Even when something isn't explicitly sinful: Does this practice reflect Christ's lordship over all of life (Colossians 3:17)? Is it beneficial — not just permissible? (1 Corinthians 10:23). Score: see full guide.
See our Is It a Sin? hub. GotQuestions and the Gospel Coalition provide thorough evangelical analysis.