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1.
noun: like a doppelganger, a double, or look-a-like. but the less attractive version.

can also be used to describe the less attractive of siblings that resemble each other.
i saw someone who looked just like an ugly version of you.

eric roberts is julia robert's doppelgagger.

dennis quaid is randy quaid's doppelgagger.

joaquin phoenix is all the other phoenix's doppelgagger.
by mugwai64 November 08, 2011
 
2.
The person who repeats a just-told joke or gag and expects the same laughs.
"Fred just told that joke so it's not going to be as funny just because you told it, you Doppelgagger!"
by ToadStool August 09, 2012