Here are some ideas of what those things could be:
- Flat-out sinful stuff - ie. pornography, anti-God stuff, things that expressly disobey God's commands, things that don't follow Philippians 4:8-9.
- Stuff that disobeys God's commands and retards our growth and our fellowship with fellow believers - ie. gossip, slander, nursing our frustrations or hurts.
- Useless time wasters - ie. things that waste time better spent on other things, like too much time at hobbies, computer games, TV or movies. These things may all be fine for some relaxation and merriment, but too much becomes foolishness.
- Silly or disagreeable or discourteous stuff - ie. the belching and farting stuff that has become commonplace; crass, if not offensive, language; constant silly talk and actions; flirtatiousness.