Ralphie's lines in the movie were quite diverse. One that stands out is 'Only I didn't say 'fudge.' I said THE word, the big one, the queen-mother of dirty words, the 'F-dash-dash-dash' word!'
One of the things she could have said was related to mealtime. Maybe something like 'Eat your dinner, Ralphie' or 'No dessert until you finish your vegetables'. Mothers in that time were very much about making sure their children were well - behaved and well - fed. And given Ralphie's penchant for getting into little bits of trouble here and there, his mother's words were always there to pull him back to the right path, whether it was about his Christmas wish or just his general behavior.
Well, Ralphie really wanted a Red Ryder BB gun for Christmas. He had his heart set on it and thought about it constantly, imagining all the fun he could have with it.