Double Stacking 

The act of taking a crap in the filling tank of a toilet. When someone flushes it later they will get a surprise when the tank fills up with...well you know.
( by the way the filling tank is the big white thing thats behind you when your going number 2, has a lid on it, it's full of water and a few moving parts)

Jake got caught double stacking at wal-mart again!

Double Stacking by M. Weazel July 16, 2008

Double Stacking 

The act of defficating in the filling tank of a toilet. The next time someone flushes it. They will get a suprise when the toilet refills itself.

Dude! I caught Jake double stacking my toilet again!

Double Stacking by M. Weazel July 16, 2008

Double Stacking 

When someone sits on the toilet and another person sits on their lap to shit and uses their thighs as a seat.

Tony was shitting and Sam needed to as well, so Sam sat on Tony and used double stacking to shit.

Double Stacking by shit-bag October 15, 2010

doublejacking

A fat chic being penetrated by two men in the ass and vagina. Since she is fat and usually disgusting, but willing,the men work fast to get it over with.

Fat susan ask bragged about her doublejacking. Shes been much happier ever since.

doublejacking by mori10 January 12, 2009

Doublebacking 

Doublebacking is a method by which the ass is wiped in a 2 stroke motion,the first pass is to get the ass about 80% fecal free and the return stroke is wipe clean any residue and stains left behind due to soft stool

Bob had to do some heavy duty doublebacking ,due to the Mexican dinner last that caused his colon to erupt with a heavy brown soup

Doublebacking by BIG T 49 November 8, 2017