Facebook Chat blue balls
you get excited because someone is online, but then they're not. You're left with blue balls because you thought you'd get some chat, but now you're just sad and mad
I was happy my crush was online, but then they were offline. Blue balls, baby.
I saw my bestie was online, clicked them, and they were gone. Blue balls for life.
I was about to text my friend, but they were offline. Blue balls hit me like a ton of bricks.