Wiktionary
on the down-low
adv. 1 (context US idiomatic slang euphemistic English) In secret. 2 (context US idiomatic slang euphemistic English) Secretly sleeping with someone other than one's partner. 3 (context AAVE LGBT English) (qualifier: of a male) Publicly identifying as heterosexual but secretly having sex with other men. alt. 1 (context US idiomatic slang euphemistic English) In secret. 2 (context US idiomatic slang euphemistic English) Secretly sleeping with someone other than one's partner. 3 (context AAVE LGBT English) (qualifier: of a male) Publicly identifying as heterosexual but secretly having sex with other men.