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!