"I asked him if I should bulk up, he told me to get fat instead"

Such a large body, so much muscle, so .... endowed.
Your sous-chef is clearly a man that loves to show off. If it isn't for his skintight pants or barely fitting apron, his non challan attitude will make you feel all warm and bothered.
It's difficult to take your eyes off of him, whether he flexes his muscles or let his fat bulge bounce around, watching him has becomes the highlight of your day.

Hard to believe a man already so imposing would want to get any bigger, yet he never stops mentioning his desperation to bulk, to get "thicker".
The new chef quickly caught on that. I wonder how long until we began seeing him grow.