“加油” is a Chinese expression. Originally this meaning came from the gas station, so it  means “add more gas into your car” to refill and to continue your smooth drive.
The expression 加 = Add, 油 = Oil is nowadays used to encourage, motivate, cheer people up during occasions or sports events to have a better performance.
Following quotes are my favorite “Add oil”s for life, I would like to share with you. What is your favorite one?

 

“Expect nothing and appreciate everything.” by tinybudda

“Never forget who you are.” by Lion King

“If you don’t know you’re going, any road will get you there.” by Cheshire Cat

“TO LIVE will be an awfully big adventure.” by Peter Pan

“如果不相信自己的可能性, 什么都无法开始!”
“If you do not believe in your own possibility, nothing will be started.”
by Paradise Kiss Live Action movie

“There’s a meaning to everything in life. So build your dreams without fear
Keep on believing”
from the song called Tegami by Angela Aki