Idk I guess it's something like "If they've ever been in the same frame together, they can be shipped" or "they both have spikey hair so they're soulmates"
That's nothing, one of my favorite fandoms ships the main character with a pair of pants and a thermos. There are official ship names for it and fanart and fanfics and everything.
Hears a few fanart I found of it, the thermos one isn't the best but, eh. I also forgot to mention the glorified vacuum cleaner they shipped him with.