it's a comical way to say "keep going" or "push through" or whatever. its supposed to be an encouraging quote and usually serves its purpose, also making that person smile
"dude i've been so sad. i can't believe he left me for that other girl"
"hey, keep your head up princess, your tiara is falling"
A sly way of calling a girl as perfect and graceful as a princess when cheering her up. An encouragement to just keep standing proud.
Girl: Ugh, literally nothing is going right today. I fell flat on my face in the audition, and my best friend is not talking to me anymore. I just feel so awful.
You: Oh that's awful! You deserve way better than that. Just Keep Your Head Up Princess, Your Tiara Is Falling
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).