Used as a word of departure; it means that the person saying it wishes for you to remain calm and keep your life in tact until they see you again (smooth not rough).
Jack: Alright, well I think it's time for me to head home
Justin: Alright, stay smooth bro
Jack: I'll try
Justin: Alright, stay smooth bro
Jack: I'll try
by Diggy070 October 4, 2023