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This term originated in theatre, coined by the venerable theatre critic Allison Ward. It can refer to a variety of situations involving a bro, but the following are the most common uses of it:

1)A friend who is not really your friend, thus for show

2) a bro in your show, thus a "show bro"

3) a bro who aids your show, whether by working in the crew, or driving you around to obscure prop shops to pick up swords.

4) a bro of whom you are proud, and thus flaunt continually
1) "I though that Karen was my friend, but she just told my secret to everyone!"

"Yup, she's a show bro for sure."
by Dormsalot November 15, 2009
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