To tease something or someone into expecting something that doesn't actually happen, most commonly used in reference to when a guy thinks he's gonna get laid but ends up getting none (see Blue Balls
"Are you actually gonna do it this time or are you justblueballing again?"
1. A painful sensation felt when a man is constantly aroused without ejaculating or when ejaculating three or four times over a short period
2. The painful feeling of all your sperm fighting their way out of your penis, usually occurs when girl stops during sexual intercourse before the man ejaculates
1. Last night I was in the middle of banging Amy when her parents came in, I was blue balling for an hour after that.
2. Have you ever tried to wank off as many times as you could and until it hurts... that is blue balling