n.
A person who ruins all fun, who is uncool and generally awkward, which makes other people feel awkward around them.
As geese (the animal) are obnoxious, loud and on the whole annoying, they are the definitive anti-bro who goes against all fun-having.
Bro1: So I was rocking this one party the other night, man and bro, it was sweet. That is until Arthur showed up.
Bro2: Why, what happened, man?
Bro1: He called the cops as soon as we started playing beer-pong, we all had to run for it.
Bro2: What a goose!
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