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1.
Keep a positive attitude
Don't be such a downer, keep the chin up.
von JT007 13. Januar 2006
 
2.
1) Oft used to reassure someone that things could be worse

2) Sometimes used as a mocking, smug phrase to annoy someone
"I notice that Liverpool lost tonight - chin up, Paul"
von WillTurner1984 11. Februar 2010
 
3.
A quick upward jerk of the head. An action that many teenage guys use as a greeting when they are too cool to say hello.
As Mary was walking down the hallway and saw her crush, she waved tentatively at him. He responded by giving her the chin-up
von CelticFox 6. März 2010
 
4.
Chin up is a phrase said to someone who has a desperately bad stroke of luck.

The phrase originated from when lanky blond people teased slighty retarded dark haired people for getting the answer to things wrong.
"I lost my phone! What the n*g*a am I gonna do?"

"Just keep that chin up!"
von Hey...hey, Chadwick, chin up! 2. November 2009
 
5.
Originated from the motion of sliding the back of your hand up your throat and doing a nice little flick at the end of the whole motion. Also known as fuck you.
Man: "Hey baby, wanna come over my house and bang?"
Woman: "Chin up!"
von Transcendent 9. November 2004