When you are told by someone that something amazing just happened, but they won't tell you. You know how when guys are just about to get it in, they get all excited?
well, if they don't get it in, and they're still excited, they get blue balls. or it just hurts them a lot, because they can't release.

Mentally blue balled means that you got all excited and then didn't complete with the exciting thing/action.
Jane: OMGAH,Jenny! You'll NEVER guess who's transferring into our school next week. You are gonna FREAK the fuck out! OMG i could barely believe it myself.
Jenny: Tell me! Tell me!
Jane: Nah, chill.
Jenny: ...

(Jenny is mentally blue balled)
by uhohrosarioh April 7, 2010
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The very uncomfortable feeling you get when friends talk about a really good story but refuse to tell it to you. It leaves you feeling incomplete and just rotten, similar to physical blue balls.
Friend: OMG that was SO funny. Like srsly the BEST story ever i will never forget it!

You: whats the story guys?

Friend: oh no way man. theres no way we can tell the story its just too funny

You: NOW I HAVE MENTAL BLUE BALLS
by dufbear August 16, 2011
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The result of an increasingly stimulating conversation that has an inconclusive or overly disappointing outcome.

Also used to describe the physical discomfort or displeasure felt after hearing a succession of lengthy jokes with dimwitted or inane punch lines.

Mental blue balls is often characterized by a dull headache or a distinct physical feeling of dismay, despondency, or dissatisfaction as the afflicted individual realizes he just wasted his valuable time and is "left hanging".
Dude, that comic told so many stupid jokes I have mental blue balls.

I got major mental blue balls today after two hours of brainstorming awesome ideas for killer iPhone apps, but no one had any idea how to implement them or even any project plans to get started.
by B.B.L.V. October 6, 2009
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