Most likely involving members of the black community "posted up" on their front steps...or "stoop". Usually for a duration of time longer than the normal 8-hour workday. Most likely dressed in white-T's, sometimes involving brown paper bagged 40's, and occassionally joints behind the ear.
"You would not believe how many stoop monkeys are out today"
by K&M est. 2003 July 23, 2008