What most naturally follows?

How to cover up a fart in high school settings
Pretend the fart was your shoe or chair.
The second you fart, move your feet on the floor so your shoes squeak.
Create a diversion by dropping a book or talking right at the moment that you fart.
Move in your chair to create noise from your chair moving across the floor or from the cushions in the chair. You could also cough at the same time that you fart.