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2 definitions by tw18

 
1.
the study of all words containing "bro"
He really knows his bronology he even says it in spanish
by tw18 November 02, 2008
 
2.
the one and only gay friend u have or a friend u think is gay
Hey man your rainbowbro is humping that dude.
I think he is a rainbowbro hes not even looking at that girls tits
by tw18 November 02, 2008