Many of you got really close!! (And of course that's not counting those of you who actually knew.) Manky is an adjective (UK) that means dirty or yucky, and old. Thank you all who played along!
On an almost unrelated note, I got a "good word" from Bubblehead the other day for using the word unnerving, and although I appreciated the praise for my vocabulary, I don't think it was deserved.
Unnerving - really, is it not used that often? What say you?