The act of taking a dump through an open sunroof into an automobile.
Jimmy McGill gave a guy a Chicago Sunroof. Too bad he didn't realize there were kids in the back seat of the car.
by dudeman3000 April 06, 2015
An act performed by a young Jimmy McGill (aka Saul Goodman) on the TV show "Better Call Saul" which landed him behind bars. The specifics of this act are unknown, but it led to him being charged with assault, destruction of property, and a possible sex offense. Though Jimmy appears to think that a Chicago Sunroof is a harmless prank, the authorities believe otherwise.
Jimmy: It was a simple Chicago Sunroof!
by Time4Pizza February 16, 2015
Climbing on top of a car with and taking a shit on the interior of the car through its open sunroof.
If you get caught giving a Chicago sunroof you could wind up on the sex offender list.
by TheBoysBadNews April 06, 2015
The act of defecating through the open sunroof of a car. Originally performed by Jimmy McGill, aka Saul Goodman on "Better Call Saul" which ultimately landed him in jail for assault, destruction of property, and also possibly sex offense charges.
It was a simple Chicago Sunroof!
by eatapeach18 April 06, 2015
The act of defecating through a car's sunroof, preferably while it's open. As seen in the Television series "Better Call Saul"
Me and Jimmy went out and pulled a Chicago sunroof on that bitch Jackie's Hyundai. She'll never steal my parking space again!
by TM38 April 06, 2015
The act of defecting through the sunroof of a vehicle.
One little Chicago Sunroof and suddenly I'm Charles Manson? --Jimmy McGill
by Simpkill September 12, 2016
The act of taking a shit in a car via the sunroof. To make this official, there must be kids inside but the act of doing must be done so without prior knowledge of anyone being present.
Jimmy McGill Chicago sunroofed a mustang. Unbeknownst to him, there were children present.
by Hotty McScotty McBoogerballs April 07, 2015