I've come across this word (phrase?) in the manga I'm reading, and I've no idea what it means. It's not in any dictionary, as far as I can tell (not in Jim Breen's, ALC, or Sanseido, anyway). The full sentence is "あとはふさいどくから気をつけて," so from context I'm assuming it means something like "difficult" or "dangerous," but it would be nice to know for sure.

Thank you!