Because of your protein farts, the size of your arms, or the size of the large vein on your biceps ?
No particular reason, the guy likes to joke around, that's OK. Since his name is Jamie, and he's dedicated to the max, I call him Jamie Cutler (also lame, I know...).
AFAIK, you're training @home, right? Does your wife call you a 'beest' or something.