An unusual relationship of any kind of fandom (i.e. books, television shows, movies, ect.) that is unlikely to happen. In fact a person must be on crack to even support such a relationship.

Dejagoo is the strange feeling that you've been in this sticky situation before. It is dejavu due to goo. Usual symptoms are shivers down once's spine followed by disgust, especially if actual goo is involved.

A relationship that is so insane, it must be on crack. Relatively common in fan fiction.

Crack ship, crack!ship, or crack pairing is a term often used in fan fiction or role playing that pairs two people pairing from different fandom universes into a romantic relationship. This can be anything from a tv show, video game, or a book. A crack ship usually makes the readers question "Why such an off pairing" Some people might like it, some hate it, and others might be grossed out.

A relationship between two characters from different fandoms (tv shows, films, books etc), that is impossible to achieve.

A friendship or relationship formed between crackheads soley because cracks attract, and enjoy doing cracktivities together.