Any of the now-familiar creepy ghosts in Japanese horror/thriller films. Aka ghost children, women with long black hair, crawly people on a ceiling, and crawly people coming out of television sets.

So named after the various forms of ghost as seen in The Grudge.

Birthday Grudge: A compound word used to describe a person's anger as a result of others forgetting their birthday. As a result the victim retaliates by failing to acknowledge the birthdays of all of those who are guilty of the forsaking. This is considered to be petty behavior, and is often manifested on social network sites (e.g Facebook and Twitter).

An intense grudge formed by an unwanted result on the grudger's own doing ; seeking revenge upon someone for defending them self.

When you engage in sexual intercourse with a person (who you otherwise would never sleep with) due to a depressed state of mind.

Looking for comfort by means of coïtus.

Doing sex with someone just to escape feeling rejected/hurt by someone else.

When a person masturbates to spite another person

Bringing up something that happened in the past, but still bothers you.

Begrudgingly having sex with a former partner one final time due to their persistent advances and attempts.