Gagging refers to lightly choking on an object to the point of making gagging sounds. Often people with penises will get off on their partner gagging on them—and the knowledge that they're big enough to induce gagging noises. Likewise, the partner going downtown may enjoy having something thrust far enough down their throat that they start to gag. It doesn't necessarily take a giant object to induce gagging—something smaller can do the trick too. However, if gagging becomes uncomfortable or if you feel like you're going to throw up (if that's not something you want to do), you should stop at any point you feel even a little bit off. Remember, kink is all about continuous consent and what makes you feel your sexiest.