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2 or more bros who are easily interchangeable between one another. If one Brotondo is busy, the other one(s) can easily fill his place.

Brotondos usually supply the bros with many brotivities, as well as a place to hang out / drink brewskis.

Also, Brotondos will never break the standard Brotocol written in the bro code. The bros usually have a preference when it comes to choosing which Brotondo to hang out with.
Bro #1: Yo, Call up the Brotondos, I got nothing to do tonight.
by fiveonefour February 05, 2010
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