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1.
When two bros are in a heated and intense competition to see who can say bro the most in a different way.

At the end of the 2009 film, "I Love You, Man", both Peter Klaven (Paul Rudd) and Sydney Fife (Jason Segel) engage in a Broathlon inlcuding the brononyms: Man, Bro Montana, Bud, Dude, Brosiph Goebbels etc...
Bro 1: "Sup Bro"
Bro 2: "Not much brosif and you?"

Bro 1: "Just chillin Broheim"
Bro 2: "Cool brodog"
Bro 1: "Yeah, so you going out tonight bro-land-security?"

Bro 2: "Dude, good broathlon"
by Milpa Bro October 15, 2011
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