The feeling in the morning after a night of sexual intercourse with a person you regret screwing

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.

The day after unprotected sex experienced by women. Usually involves a regular hangover coupled with the negatives effects of the morning after pill. This combo with the addition of the "fuck im an idiot" feeling creates the ultimate in feeling like shit.

the result of hardcore sex where you cant feel your body any more and you feel hung over but youve just had sex no alcohol and your done!
you want more but your body cant take anymore because your to worn out.

The painful sensation often resulting from particularly rough sex, often dark hickeys, 'burn marks' and bruises are clear signs of a bangover

The lethargy and lack of motivation that can result from having vigorous sex too early in the day.

like the word 'hangover' but not from drinking, a bangover is after sex has happened sometimes you can be feeling shit about having sex, and it makes you feel ill.