A person who so eerily resembles another person that you can't help but belt out the word "dang" to convey disbelief.
"Dang! That guy looks so much like your dad it could be his Doppeldang'er!"
DAH-PULL-DANG-ER (pronoun) is an interchangeable term typically used to describe an indescribable object generally that one was just using and now cannot find, furthermore and for whatever reason, the individual cannot articulate what exactly said item was only further compounding the verbal breakdown. Insert 'doppeldanger' to expedite communication despite limited information.
Has anyone seen that there doppeldanger?? I just had it!