Someone that you ignore and find as irrelevant as hitting a squirrel in the middle of the night with your car.
Hitting the animal creates a bump that easily felt but subtle enough to where you think you've just ran over a pothole or some other object but you simply ignore as you want to carry on driving home from a long day.
Jimbo: Why are you even talking to me? I don't know you, you are nothing. You are just a Bump in the Night.
Ruler of Lake Titicaca. Rumored to have a bunghole that gets very angry if it does not receive toilet paper. Cornholio the Great is often seen walking around with his shirt over his head and his hands in the air, chanting songs about his power, and his bunghole.
"I am Cornholio! You do not want to face the wrath of my bunghole, for I need TP!"
Butthead: Shut up, Beavis! (uh huh huh huh)
Beavis: Um, okay. (heh heh heh heh).