Poetic way of telling someone that they are extremely brave or heroic. But it is also used ironically when their bravery goes too far and turns into madness.
The term "falling star" is used because symbolically, the rocks that turn into shooting stars have the courage to enter the Earth's dangerous thick atmosphere in order to make skywatchers happy and allow them to make a wish.
Person 1: Have you read in the newspaper that this guy conquered all of his biggest fears and revealed all of his secrets to the public in order for his crush to accept having him as her boyfriend?
Person 2: Wow, so it is true that love makes you as brave as a falling star.
This is a term used to tell people to subscribe to Flamingo the Roblox Youtuber. He used it in a video, but it got censored by the Roblox chat filter. He tried to make everybody say it.
When someone is first learning how to snowboard and they are scared shittless to attempt carving, so they go all the way down the slope on their heal side by first heading downhill with their dominant foot, and then their other foot, immitating the motion of a falling leaf.
Sarah was tired of falling on her ass every time she tried to carve, so she just did the falling leafall the way down the slope.