The phrase "pistol squats" refers to a type of exercise where you squat down and back up on one leg, while the other leg is stretched out in front of you. Full definition
With some practice and persistence though, you should be able to complete reps of pistol squats in no time at all. (ironmanmagazine.com)
For example, if you have trained with pistols squats the day before and your legs (quads, glutes, IT band, etc) are tired, you should focus your attention on your lower body. (ashotofadrenaline.net)
Have you ever wanted to achieve 25 pull ups in a row, a perfect handstand, 5 pistol squats in a row and more? (ashotofadrenaline.net)