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2.
The act of flushing the toilet a second time because the first flush did not evacuate all the poo/vomit and tp.
After eating Taco Bell last night my first crap this morning required a double flush.
by Lumpy76 December 09, 2005
 
1.
The technique of washing your arse after having a shit and not having any other way to clean your arse. the double flush is done by flushing the toilet, cupping your hand and cleaning your arse with the flush water.
Maj: Theres no toilet paper and I need a shit.

Kamy: Just do the double flush, intit.

Zed: Whats this double flush business?...Im hungry.

Kamy: You know, double flush it, intit. Put your hand under the water and clean it! Intit!
by Flushed February 01, 2013
 
3.
when you poop in the toilet and you flush it and look back and there is still some poop there or skid marks, you give it another flush and its all gone
Man, i took such a huge poop the other day i had to double flush that sucker.
by Cortizz April 25, 2008
 
4.
To double flush (verb). Used to describe the necessity to flush a toilet twice when a fecal explusion from the body is exceptional in terms of quantity (i.e., pure mass) and/or quality (i.e., lettuce).
Mother: "Boy were you ever in the bathroom a long time."
Son: "I think that was the biggest crap in my life. It was so big I had to double flush."
by Filibustered January 12, 2011