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1.
#1. To take a crap so big that your pants fit better.
#2. To crap a turd so big, one end is sticking out of the water.
#3. To crap so big around you have to break it up with the plunger and flush twice.
#4. When you take a crap that stinks so bad, you give a courtesy flush half way though. This act cuts down on the room aroma.
Hey Dude, I shit a Double Flusher so big, I heard my butt cheeks slap together when the pointed end came out.
by Doug Hightower September 22, 2005
 
2.
A shit so immense that a single flush is insufficient to fully clear the bowl, therefore requiring one to flush the toilet twice.

A crap so massive that it requires two flushes to cleanse the throne.
Whew! That double flusher wore me out! Red beans and rice do it to me every time.
by Mr. Corruption June 10, 2005
 
3.
When one takes a shit so large it requires two flushes to completely get rid of the shit and any evidence of its existence.
John had McDonald's for breakfast, Taco Bell for lunch, and had to take a double flusher before we even got to dinner."
by Pilotguy44 January 19, 2010
 
4.
When just one flush is not enough to get the job done!
Dude, it must have been that late night taco stand, I had a serious double-flusher this morning. I'm just sayin.......
by p mammen August 20, 2011