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9.
1. Flushing the toilette more than once and ASAP to reduce the unpleasant scent of your own turd(s).

2. Something you had better do when you are in jail or prison, so your cellmate(s) don't/doesn't give you a beatdown. LOL!

3. If it smells bad to you, how much worse will it smell to the other person if you don't have the common sense, or the decency to do a courtesy flush.
Redneck/Jail/Prison definitions:

EX: Dude! Could you at LEAST do a courtesy flush!?!?!?!?

EX 2: If you don't do a courtesy flush you'll be getting a blanket party tonight!

Ex 3: If you don't want a swirly. gimme a courtesy flush over there.
by IrishDaddy2U April 18, 2010
 
1.
A flush in the middle of the toilet-sitting process in order to reduce the aroma...usually performed on a "foreign throne" as a courtesy to the owner of said throne... in other words, to be polite and not stink up the host's crapper too much.
I gave a courtesy flush at the Smith's party because I didn't want to kill the next person to use the bathroom.
by peafarter January 04, 2003
 
2.
When you're using a public restroom and your shit smells so bad you flush it as soon as possible so as not to make everyone else in the restroom puke.
Hey, how about a courtesy flush?
by Logroller September 07, 2005
 
3.
Flushing the toilet at the exact moment of a smelly bowel movement hitting the water as to minimize lingering oders that may eminate off the perpatrating poo. Keeping the bowl poo free will keep the bathroom odor to a minimum.
Courtesy Flush after releasing a smelly chocolate hostage
by Poo Man Choo February 22, 2007
 
4.
A flush done in the middle of doing your business to either A) reduce the smell or B) reduce the chances or clogging the toilet.
Bob: What took you so long?
Phil: My shit was so massive that I had to do a courtesy flush like every thirty seconds.
by B3K@H September 07, 2009
 
5.
A term popular in jail. A courteous thing to do when you have a cellmate and are in the small confines of a jail cell. A method you perform when in the jail cell to eliminate the smell of your bowel movement. Usually executed at the point of release from the anus and before it hits the water. The suction of downforce of the flush eliminates the gases as well as the odor of the loaf.
"Yo, do a courtesy flush bro, that shit smells dude."
by ChrisTW82 March 08, 2008
 
6.
When you're in a public restroom, going number 2, flushing the toilet while you're still using it to lessen the odor and as a neighborly gesture.
Yo dude, give me a courtesy flush........you're making this bathroom rank.
by UnKleslam August 07, 2009
 
7.
The act of flushing multiple times at a guests house, or a party ensuring the probability of clogging the toilet is slim to none.
Yo dude if your going to take a shit, be sure to courtesy flush a few times
by Silver fear March 28, 2012