In cooking terms, to burn a meal to the point where it is virtually unservable; to grossly overseason a dish so that it is inedible; or to perform some other act of gross incompetence.
If you combine four pounds of ground hamburger with four pounds of refried beans, you may be clever enough to become a cook at Taco Tim's. But, if you foolishly add six pounds of jalapeno peppers to that mixture, you've just Randallized it and there will be a lot of complaints from the customers.
To ask a question you already know the answer, just to make yourself feel smarter or to monopolize the conversation.
That new guy is always ranallizing the conversation. I hate his guts.