When something is so terrible that even bothering to add the 'e' is saying it nicely.
"Dude, that's major cringworthy."
"Isn't it cringeworthy?"
"You are not worthy of the 'e' in that word."
Anything that makes you cringe from dank memes to that weird face your friend makes at lunch and especially Musical.ly videos of kids lip singing.
Boy: "Did you see Kevin Hart's new video?"
Girl: "OMG yes that was soo cringworthy"