1. A just all around bro.

2. A buddy or friend.
"Yo whaddup Bro-horn you score and waves at Mavs the other day man?"

"Yo theres my friend Monty is so chill, such a Bro-horn, he wears Pumas, beanies and he laxes, no doubt about it, straight up bro-horn lovin from Monty"
by Lars Umayat April 27, 2009
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