A man with larger than average testicles.
"Man, Stew has got some Fat Balls".
"Stew is all balls" - "yeah man, he has serious fat balls".
A con artist who makes their fortune by fooling wantrepreneurs into thinking they're getting a great deal or coming into some easy money when the reality is it's the contrepreneur making the real money.
Nigel told the desperate group of wannabe entrepreneurs that they'd all be millionaires in six months if they paid him 15k, but Nigel was the only one getting rich, Nigel was a Contrepreneur.