down low noun 4adjective 2forms 4 noun4 •A state of secrecy.I'll tell you, but keep it on the down low. •(slang) The state of being a man who secretly sleeps with other men. •(slang) A man who secretly sleeps with other men.I think it must be hard for trans men who like guys. Most gay guys don't like vaginas. […] The guys I'm interested in are down-lows, DLs. — 2014 •(slang) The state of being a man who secretly sleeps with people other than his partner.[Chorus]:And keep it on the down low Nobody has to know. — 1995 adjective2 •Undercover or lying about one's identity. •(slang) Purporting to be heterosexual while engaged in sex with men. formsdown lows · down-lows · more down low · most down low