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2.
1.) A man who secretly partakes in homosexual conduct, but lives a hetrosexual lifestyle. Often married, with childern.
2.) A man who many women believe is gay
"Hey, girl did you hear about Shay?"
"Yeah, I heard to beat the black off of her man when she found out he was a downlow brother!"
by Brittany_notyourgirl August 27, 2005
 
1.
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.
by Nancy Wilson September 18, 2007
 
3.
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.
by Nay Nay Hill July 10, 2005