This is the 9858th most frequent Russian word.
автоматом
Automatically; by machine; without conscious effort.
In this sentence, "автоматом" means 'automatically' or 'without effort', implying the action occurred without additional required input.
Он сдал экзамен на пятёрки автоматом.
He passed the exam with top grades automatically.
Here, "автоматом" suggests performing tasks instinctively or quite naturally due to familiarity and repetition.
После долгой практики он выполняет эти задачи как автоматом.
After extensive practice, he performs these tasks automatically.
In this context, "автоматом" refers to a machine gun, demonstrating a different usage of the word.