Both "skibidi" and "delulu" have been added to the Cambridge Dictionary , and if you don't know what those words mean, congratulations, you're likely an adult with bills to pay and better things to do. Good on you.
In case it wasn't clear, both words are inventions of folks — younger people, more often — who spend too much time on the internet. Still, it might be worth learning the definitions of such words, since the internet is increasingly the IRL world. And spending too much time on the internet is pretty much what we do here at Mashable.
Funnily enough, the dictionary basically defined skibidi as gibberish. It referred to skibidi as "a word that can have different meanings, such as 'cool' or 'bad', or can be used with no real meaning as a joke." It's the internet's un