I found this great explanation of what it is to make a Doobie in hair.
What is a “DOOBIE” ??? If you are a Latina/African American girl living in one of the five boroughs of NYC then you will recognize this as the “Doobie”! Curly haired girls love the doobie.. You wash it, leave in conditioner and then you let it dry naturally while it’s held in place with bobby pins. It takes forever but it’s worth it and no hair dryer, no flat iron and no damage. Love how she “blings” her doobie.