Script (guión): Idioms, ‘by the seat of your pants’. If you do something by the seat of your pants you achieve it by only a narrow margin. I only just made my flight to Chicago today by the seat of my pants. All the trains to the airport were cancelled and the motorway was held up by a cow that had wandered into the road. After all that the taxi broke down on the motorway 2 miles outside of the airport, so I had to walk the final part of the journey. It was so stressful, I think I need a drink now just even thinking about it.