-Sandwich?
-Yeah, sure.
-CouId you put that on a croissant for me?
-CertainIy.
-Swiss?
-No, GorgonzoIa.
Hey, thanks a Iot
Yo, man, how you gonna pIay a brother
on the Grey Poupon?
What"how you gonna pIay a brother on the Grey Poupon" means?
"Grey Poupon" is a brand of mustard. He seems to be asking what the situation is regarding mustard.
This would seem to be an African American dialect (or imitation of it), with the reference to himself as a "brother."