hold that down

To stop, To Chill when doing or saying something outta pocket

*Tantrum is being thrown*
Person: AYE! HOLD THAT DOWN NOW

ima hold that down

basically it means ima keep my opinion to my self or on the DL (down-low).

person1: so what do u think about them together?...

person2: ugly couple
person3: yanno what ima hold that down it aint my buisness..
person1: truee