Top Definition
A Brononym is a synonym for the word bro, used when someone has been called bro and needs to respond with another bro-like word.

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...
Bro1: Sup bro
Bro2: Not a whole lot brodike
Bro1: Woah dude, no need to be a brodouche

Bro2: Suck it Han brolo
Bro1: You suck it broklahoma

Bro2: Whatever, brohio
Bro1: Hahaha, those were some good brononyms bro back mountain
by Milpa Bro October 18, 2011

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