cross overization

Cross-overization,
a noun form of "cross over", which can already be used as a noun

Zhang just made a cross overization on Yang.

Twigbranch Over

Twigbranch is a character in the bookseries Warrior Cats who switched clans, or the groups of people that she lived with, multiple times due to indecisiveness. When a cat changes their clan in warrior cats, this is sometimes referred to, by the fandom, as "Twingbranch-ing theirself over" to the other clan.

Person 1: "Man, forbidden romances in warrior cats are so forced!"
Person 2: "I know, right? Why don't they just Twigbranch Over to the other clan to be with their love interest?"

fight over shreddies

based on the ads for Diamond Shreddies, it means to argue over things that are basically the same.

"Dude, that's a circle,"
"Naw man, it's an oval!"
" Oh, come on stop fighting over shreddies!"

"Is that a husky-terrier, or a husky-poodle?"
"Dude, it's a dog, don't fight over shreddies."