The act of flushing a toilet before wiping to minimize the chances of clogging
I went over to Dave's house after going on a date to Chipotle. Needed to courtesy flush to save from the embarrassment.
by JakeofGears July 5, 2018
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Flushing while shitting. Although this noble gesture is meant to reduce the foul odor of your newly born treasure, there is a personal benefit. If you time this correctly, the turd that's still attached to your ass will get a helping 'pull' from the water below, giving you an extra inch of room your colon.
I shoulda known but the skids in bowl that she wouldn't have the decency to courtesy flush.
by Ferranz March 22, 2017
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A process carried out by university administrators in the Autumn term which involves shedding students who don't turn up regularly to classes to ensure they aren't charged fees and become an unnecessary financial burden to the institution. This is performed by the student being summarily "deregistered" on the grounds that they are "inadequately engaged" on their programme of study. As a result, students find they are suddenly unable to submit coursework or access any university facilities whatsoever, thus providing proof that they are indeed no longer engaged.
Chris the student: Hey professor! Why can't I submit coursework or access any online library facilities in order to complete my term papers?

Professor: You've probably become an unwitting victim of the most recent "Autumn Courtesy Flush."

Chris: What's that?

Professor: You've been deregistered because you haven't been coming to class.

Chris: My God! But if I can't submit assignments I'll fail the year.

Professor: Yes, well you should have thought of that, shouldn't you? Anyway, good luck with your career.
by The Gonzo Lecture April 18, 2010
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Let someone know if, awhile after a first date for example, you're not interested in pursuing the association further.
"I had hoped to get a courtesy flush if you decided you liked that tree-huggin mothball motherfucker better!"
by sweetDICKwillie March 3, 2014
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A cleansing toilet flush when caught taking a dump whilst on the phone
Bob; "Phhhlt" <plop>
Phil: Dude! Are you taking a dump?
Bob: Yeah man, can't wait.
Phil: How 'bout a courtesy phone flush? I can't concentrate on our

conversation!
by nextdaycorn July 24, 2010
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When you take a mean ass shit, and you either use too much toilet paper or it fucking stinks of shit - so you flush before you finish.
Josh: "Yo, dude. What the fuck? It reeks of shit in there! Why didn't you courtesy flush?"
Robin: "Shit, bro. I'm sorry."
by livingm3m3 May 8, 2021
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When you find someone else's shit in the toilet and you have to flush before you use it
I got into the stall at the restaurant and had to do a reverse courtesy flush for the guy before me before I could drop my own deuce.
by LeafyGreens37 December 15, 2022
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