A 'Bro with three O's' is a girl/women in a group consisted of all boys/men. The girl is treated as just another 'Bro', and mostly acts like another 'Bro'. May still be recognized as a girl, but for the most part, treated as just another 'guy'.
by Bro with Three O's February 18, 2011
Get the Bro with three O'smug.