The Pathological TMIer has the tendency to blurt out far too much personal information that would have been better left unsaid. Similar to a Pathological Liar, they can't seem to keep the information inside, no matter how ridiculous or embarrassing it may sound to others. They have no shame regarding their blatant use of TMI (Too Much Information). On the other hand, the Pathological TMIer ALWAYS tells the truth, even in cases where a lie would most likely be better for their reputation.
"Last night I had a wet dream involving SeaBiscuit."
"Your Father and I went skinny dipping in the moonlight. There were three full moons."
"I named my aborted twin fetuses Winnie and Pooh."
"Just so you know, Yeast Infections taste pretty good!"
The anxiety you feel when you receive an email notification that someone has tagged photos of you on facebook. Tagxiety usually involves sweaty palms and a frantic attempt to log on to facebook to A) make sure the photos are acceptable or B) untag said photos before anyone has a chance to see their complete fugliness.
That photographer keeps tagging horrible pictures of me at karaoke night... doesn't he know I have high tagxiety?!?! I look like I'm sucking a microphone dick!