I have wanted a good definition of this for years, I think I finally have one.
Walking with God:
Paying the price in time, prayer, and sacrifice to understand God's perspective of our life and work. Once understanding it, diligently setting about our Father's business. As we pour out our lives in rolled-up sleeves, sweat (tears!) and service for His purposes, we will feel God's power course through us. When this pattern of seeing as God sees and working with Him become a day-in, day-out lifestyle, the Bible calls it "walking with God."
In the book of Acts the entire church demonstrated this kind of relationship with God and consequently the power of God flowed through the whole church.
Doesn't that sound amazing??!