Holy in our thought life
this means that you are not supposed to have sinful desires, such as lustful mindsets (Ephesians 5:3) and minds full of anger or hatred (Ephesians 4:31)
however, it doesn't mean that we must be 100% Holy, thinking about God all the time and not caring about your fellow brothers or sisters in Christ.
Holy in the way we dress
this means that we do not wear clothes with words such as vulgarities or anti-Christ messages, but instead, wear casually.
this also mean that we should not wear clothes that are too revealing, as our body is a temple of God.
However, it doesn't mean that we must ALWAYS "wear" Holy, such as wearing t-shirts with printings such as "Jesus is love" or putting on a cross where ever we go.
Holy in what we listen
this means that we should not listen satanic songs such as "emo-emo" songs which will make us feel sad, or listening to people talking about sexual issues, et cetera.
however, it doesn't mean that we must CHANGE our genre of musics too 100% Christian songs, trying to be "Holy".
Holy in what we say
this means that we should not scold vulgarities or insult others (Ephesians 4:29). Instead, we should "make full use" of our mouth to encourage those who're facing problems, and also to preach the gospel.
Holy in what we do
this means that we should not be "acting" like a hooligan, for example pointing middle fingers where ever you go. instead, take the opportunity to pray for others. (i.e. have a short prayer between 2 people at a corner in the library)
Holy in what we watch
this means that we should not watch satanic shows, such as pornography. this is considered adultery and idolatry in God's eyes. When we watch pornography, we're actually worshipping the devil.
instead, cleanse yourselves from this kind of sinful movies,.