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!