Why is chuck so cheesy?

Nobody's got the guts to reply, for they all know, you don't effing mess with chuck

Randal Graves: This job would be great if it wasn't for the *beep* customers.

because chuck IS the cheese, d'uh

They never showed him eating the pizza they picked up because his friends wife and son were killed by Cota and his goons, so we don't know how much cheese was actually on the pizza