A fanfiction in which several fandoms interact with one another.

Cross-overs largely involve time travel and interdimensional travel to meld two different fandoms.

1. Generally performed by two males, the cross over involves the first male placing both hands inside his partner's pants - one over the buttocks, and one placed firmly over the groin. The male's partner returns this action, so that both arms cross over. This is typically performed in public, as a statement of pride in one's relationship. Experienced couples often resume walking while performing the cross-over, though this is a difficult technique and not recommended to beginners.
2. A dribbling technique used in basketball to change the dribbling direction quickly.