The Cave In

When you fill a girl/guy 's asshole or dickhole or pussy with krazy glue.

v. To give up to all opposition, usually in an argument.

The psychological need of someone to close down the window shutters, dim the lights, turn off the phone, eat junk food, surf on the internet, watch TV, listen to music and use drugs, remaining in this condition for few hours, days or weeks, into her/his flat, denying to go out or to meet anybody, like she/he is hiding into her/his own cave. Strongly connected to Minor or Major Depression and Agoraphobia.

The ongoing act of giving in to something.

When Keine Kamishirasawa from the Touhou games transforms on the full moon, goes crazy, and rapes you in the ass with her horns.

The term's association with said ass-raping comes from a butchered English-to-Japanese machine translation where "caved!!!!" became "screwed!!!!". Used by mostly Japanese-speaking Touhou fans, but a few English-speakers have also adopted the term.

One's secret and warm hiding spot away from the torments of the real life. Inside the cave, one finds one's true friends, comrade and well wisher. It is a place of fun and laughter but also a place to introspect and engage in deep talks. One goes into the Cave when one wants some respite and find happiness from one's crappy life.

Caved on, caving on
To Cave on is commonly used meaning having a repulsive gesture and figure against being fingered(by a loved one or anyone else in particular).