Dank

'Dank' means the same today as it did in Middle English, though the word 'damp' is now more common, I suppose. (We won't comment on today's slang usage.) 'Dank' began as a verb, as in 'to moisten,' and likely comes to us from Scandinavia. That 'dank' would be an insult is my own creation, though I don't think it an unlikely usage. (Think, "You're all wet.")