The flight was overbooked, and I was the first to 'be bumped'. [=my seat on the flight was the first seat to be given to someone else]
His career hit a 'bump' in the road. = His career hit a road 'bump'. [=something happened that slowed the progress of his career]
The airplane landed 'with a bump'. [=the airplane went up again and then down when it hit the ground]
(..) Ohhh. Simba, wait up! It's awful, isn't it? I didn't want to believe you. What made you come back? I finally got some sense knocked into me. And I've got the bump to prove it. Besides, this is my kingdom. If I don't fight for it, who will? I will. It's going to be dangerous. (..)1994 The Lion King