Abs is all food bro. I have a full six pack and v lines all connecting muscles and obliques exposed. I'm also under 5% BF and I eat like a beast(healthy, frequent, lots of protein). Genetics + proper diet + hard work. Theres honestly no short cut unless you starve yourself and loose muscle. Some good ab stuff http://www.simplyshredded.com/
check it out.
I've had a belly when i'm bulking and somehow my abs will still somewhat show lol..