When a person (typically one who is underage) who is not permitted to smoke a cigarette for whatever reason believes is being watched by an individual who will bust him for his smoking, cups the cigarette for a long period of time.
Teenager #1: "We went out to smoke a butt and Josh just sat there roastin a stoge 'cuz he thought his mom was watchin him."
Teenager #2: "That kids mad sketchy. Let's smoke a bowl."
Teenager #1: "Ok."