Urban Dictionary is the ultimate repository of informal language, but it's not just a database of slang and sex moves that nobody should ever try. Normal words are also assigned some very random definitions.
Scientists have learned how to speak monkey. Researchers at Durham University claim to have translated 450 regular "words" used by an ape species in Thailand, used to signal dangers and chat about what insects they fancy for dins.
OED claims countryside words have little meaning these days, as most kids are miserable solitary indoor content consumers strung out on Doctor Who and the promise of IAPs being allowed if they're obedient and don't touch daddy's precious collection of video game toys.