"Chooku" is a new bad word invented in November 10, 2019 by a 13-year old kid in California.
Chooku either means:
a) Another word for dick
b) One of the names of the cells of the penis

A man who messes around with other men, but no one would ever know by looking or talking to him. Used by gay black men to identify masculine gay men or DL Brothas.