fabylous - when you're too f***ing dumb to know it's a real word and yo

when you're too f***ing dumb to know it's a real word and you say it's a f***ing made-up nonsense.

"Fabylous? That's f***ing nonsense. It's not a real word.", @kevin789

"I don't know what that means. It's f***ing nonsense.", DM from @anna543

"That word is f***ing nonsense. I don't even know what it is.", comment from @dave654