down-low

down-low or down·low [doun-loh]Slang. Word Origin adjective

1. of or pertaining to men who secretly or discreetly have sex with other men: She once dated a down-low guy.

Idioms

2. on the down low,
   1. (of a man) secretly or discreetly engaging in sex with other men.
   2. secret; discreet: Okay I’ll tell you, but keep it on the down-low.

Origin of down-low First recorded in 1990-95; down1 + low1