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15.
Often accompanied by a hangover. A bangover is the usually not so cool feeling one is gifted the 'morning after' a night of beer goggles and ah, bumping uglies because you could. Not necessarily a good idea, but it seemed like genius at the time.

Accentuating Factors (things that make a bangover worse): He/She was coyote ugly. He/She was your cousin. His/Her nickname is 'cum bucket'. None of that is any good!

Attenuating Factors (things that make a bangover not so bad): He/She was hot. He/She made you cum so hard that if it didn't stop, you would squeeze out a kidney next time. He/She taught you something new or made you laff so hard you were worried about crapping yourself or sharting. All of that is awesome!

In contrast to a hangover, which has absolutely no potential of being anything but annoying, a bangover at least has the potential to generate some shits and giggles down the road.
While texting (or fexting):

You: Ahhhh! Nothing like a brisk summer thunderstorm to wash away a bangover!
Them: Bangover? Wondering what else you got into last night...
You: Oh shit! *epic* typo!
You: Sadly enough, all I have is a hangover. Tip: You will always lose a shot contest with yourself.
by Yagotta B. Kiddin June 21, 2014
 
16.
The act of having sex with someone that you have had sex with previously. A "bangover" usually occurs when you are intoxicated or just lonely. You typically realize why you stopped banging someone in the first place after your "bangover" is done.
Last night I had a few glasses of wine, was feeling kind of lonely, so I decided to have a bangover with Alex. This morning I remembered why I stopped banging him in the first place....no matter how hard he tries, it is just never going to get any bigger.
by djsextornado April 24, 2011
 
17.
Bang-over (bang-oh-ver)

noun

1. The inability to start a new book because you are still living in the old book's world

2. The inability to function at work/school because you were up all night binge-reading
I've got such a massive bangover I can't even face powering up my Kindle

Abigail was sent home from school early she had such a bad bangover
by Pat Pat Pat Pat Pat June 08, 2014
 
18.
Feeling like shit in the moring because you were up all night F*cking.
I'm tired as sh*t and my d*ck is sore, I got a horrible bangover.
by samtheman1 February 23, 2010
 
19.
The resulting soreness subsequent to a day/night of rough sex.
"My favorite fuck buddy was over last night, so today I have a wicked bangover."
by auralphyxation September 13, 2011
 
20.
unpleasant physical effects (fatigue, soreness, and overall lethargy) caused by excessive copulation.
Hey girl, you wouldn't believe what happened after you left last night. I met up with all these sailors on shore leave and they swabbed my deck all night long. I have the worst bangover ever.
by elwiggs November 29, 2009
 
21.
An extreme variant of the traditional hangover, brought about from a combination of extreme alcohol consumption and excessive head banging.

Sexual References can be made as regards to a similar noun - 'gangbang' and the bangover being the result of such debauched actions.
"Dude: I have such a bangover from last night!"

"What a hell of a night dude...best bangover yet :P!"
by PrincessOfPeaceIsBkNShesPissd October 28, 2012