A dick. And ya know what? If I’m not drunk this is usually how it feels.
Once, while still young and alive with ambition, I was deep-dicking a girl on her back with her knees around her ears, and one of us lost the rhythm. (Probably me.) Next thing you know, I was balls-deep in her asshole.
And yes, it was a lot like the GIF. Except that in our version, the skateboard breaks in half and a splinter takes out someone’s eye.