'Friend dictionaries' on TikTok show how loved ones create their own languages

For one pair of sisters, a brisk day isn’t chilly — it’s “Chilean sea bass.” And for one couple, they don’t receive deliveries — they “got a parcel.” These phrases may be unusual to the average person, but to some duos they are common sayings. Best friends, siblings and couples alike are sharing their inside jokes and shared lingo on TikTok. Dubbed “friend dictionaries,” and sometimes couple or sister dictionaries, these words reveal the secret languages people have with those closest to them. The trend features videos of duos testing...