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Inter-bros are bros who only know each other through the internet. It's a guy who you know would be one of your best friends in person, but you only know each other through sites on the internet such as 4chan, or tumblr. It can also apply to bros who moved away so now they are only reachable online.
Friend 1: "Dude, steve breznek would totally be in our friend group if he lived here."

Friend 2: "I know man, he likes all the same things we do. He's totally our Inter-bro. "
by Neverkilled December 10, 2011
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