Buttplant
You fall backward and land on your behind. The opposite of a faceplant. Common during learning, reverse riding, or overly aggressive braking.
When it happens
Leaning back too hard while braking. Fighting tiltback instead of decelerating with it. Practicing reverse and losing balance. Sometimes the wheel just scoots forward out from under you.
The good news
A buttplant is usually less severe than a faceplant. Your tailbone disagrees, but your face, wrists, and elbows are typically spared. At low speed, it’s embarrassing more than dangerous.
555 take
Buttplants are part of learning. They teach you where the braking limit is and how tiltback feels. Padded shorts exist for a reason if you’re in the early stages.