Well you can certainly *reveal* definition that way, just not sure if you can build it up. But if you've ever seen a seriously too-thin person (like, ED thin) and you can see the little outlines of their muscles you realize that even people who are cannibalizing muscle tissue (and hence have very little of it to show) can show definition if their body fat is low enough.
Check out www.bunklers.com. You're going to love her, I predict. She's a normal person--a real-estate agent, actually--not a bodybuilder or a fitness model, but MAN is she cut. She eats perfectly clean damn near 100% of th etime, and she's really honest about how she wants to eat junk food and it tastes good, but it'd be incompatible with what she wants. She says "eat exciting food, have a boring body. Eat boring food, have an exciting body!" which I love :) 2290 days ago