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Down Low Brother 

A married man who turns into a bisexual by having anal sex with men outside of his marriage.
Alex got married and a year later turned into a down low brother.
Down Low Brother by Nancy Wilson October 2, 2007

down low brother 

a male who is hetrosexual but have sex with other men on the side.
Did you know that Bill is a down low brother, because Jack told me they been having sex for about a year now.