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1.
The feeling of overwhelming guilt, stress, and worry you experience the day after a drinking binge. Hang-over Anxiety. Hangxiety!
Fuck. I may or may not have done a two man conga line through the Church of Scientology last night. I've got the worst hangxiety. Fuck!
by McMuzz May 02, 2011
 
2.
A combination of being Hung Over and having Anxiety. Not only are your physically ill, but you also have high anxiety caused by erratic behavior and Black Out periods the night before.

The 'bad feeling' you have the day after a night of heavy drinking, both Mentally and Physically.

Physical effects of Hangxiety may include heart palpitations, fatigue, hot flashes, nausea, stomach pain, vomiting, and headaches.
Andy: Dude, you ok? You look like you're going to die!

Steve: I drank too much last night, I might throw-up all over myself. Plus, I can't remember shit, I just know I wasn't good, and I feel worried about what I might have done and said.

Andy: Ahhh you just have Hangxiety. I have that every Sunday. You'll be ok tomorrow.
by OverDone February 08, 2011