It took many failures and split testing to figure out the best answer to this question and I'm sure it will be different for each community (types of people - I.E. The Niche) that your going after.
But for my community, the people I hang with and meet (My Niche) the best answer which makes the most people amazed and ask the fewest questions is you say.
"I run my own company"
They ask oh really what is it about, what do you do?
You Say "I do online advertising and marketing".
They then may say "Oh really how do you do that"
You then say "By building websites"
They then say "oh cool"
And there is a job well done, now you move onto how big her boobs are (However that last part still needs a bit of split testing)