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 7, 2015
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I hated that guy so I seen his car, and gave him a California Sunroof.
by bert2006 April 25, 2015
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To shoot the top of someone's head off
Tim: Yo man, I heard Ramone owed you 20 dimes and ain't paid up.

Chaz: Yea, he tried to Punk a brotha, so I gave him a Beretta Sunroof.
by chaz714 March 4, 2008
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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 17, 2015
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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 7, 2015
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A variant of the Chicago Sunroof where instead of defecating through a sunroof, you pour a tub of piss through a sunroof.
"Nelly pulled a Chicago Sunroof on my Camaro so I pulled a Detroit Sunroof on his Volkswagon".
by Thecocaomeister3000 October 9, 2022
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When you climb on someone car, in the middle of a piping hot summer, and take a fat gelatinous shit threw the sunroof and leave it in the vehicle to boil.
“Yeah, he may of fired me, but just wait until he finds that Arizona sunroof in his car.
by Bootyjuice12222 November 28, 2017
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