A person who chases after something that can't be caught or pursues something that is futile.
Origin. Based on a person who tries to chase the wind in hopes of someday catching it, actually grasping it with his hands.
Yo, you still trying to get with that girl?
Nah, man. I'm not a windchaser. I gave up on her a long time ago after she said no and didn't leave it open.