The phrase "big roast" refers to a situation where someone is being publicly criticized or made fun of by others in a teasing or sarcastic way. Full definition
I like a one bowl because there's plenty of room to soak big roasting pans. (vanessafrancis.com)
If you are wanting to have a nice turkey dinner but don't want all the mess of big roasted turkey dinner. (drizzledwithflavor.com)
Their website is an amazing resource as well as their app — if you need to know who big a roast you should get for how many people you are serving, to great recipes and ideas on how kick up your beef game. (mybizzykitchen.com)