“Skibidi,” pronounced SKIH-bih-dee, is one of the slang terms popularized by social media that are among more than 6,000 additions this year to the Cambridge Dictionary.

This week, the Cambridge Dictionary made it plain when it officially added words born in the chaos of TikTok such as “skibidi,” “delulu” and “tradwife” and dignified them with definitions.

“Internet culture is changing the English language and the effect is fascinating to observe and capture in the dictionary,” said Colin McIntosh, Lexical Programme Manager at Cambridge Dictionary, rep...