Proper way to order a fast food meal:
"I would like a (Insert number or combo here), (Insert primary modifier here (With Cheese, no cheese, grilled, crispy, etc)), (Insert Sandwich modifiers here (no lettuce, no tomato, etc)). (Insert Scaling Modifier here (Supersized, Go Large, ETC)). With (Insert side option here (Fries, Rings, Salad, etc)). And a (insert drink preference here) to drink. And"
Either repeat or "That will be all".
Example: I would like a number one with cheese no tomato add bacon large with onion rings and a coke to drink and that will be all. At BK you would end up with a tasty Whopper with cheese meal.
I spent a lot of time working BK and people that ordered like they knew what they were doing I would never upsell to unless there was a special going on. They know what they want, it's not my business to tell them they want something else. Now the people that doddle around and order 4 different meals all different sizes then forget to tell you the drinks and just say "coke, sprite, orange, and coke" at the end without specifying which meals they go with... Yeah I'd fuck with those people all day.
Now, as to the OP. I've never ordered that way. When I did work BK if someone said they wanted a number 3 they were getting a whopper jr fries and a soda of some kind. Maybe the times have changed.