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

Double stocking wank 

The act of two women giving a man a footjob together whilst wearing pantyhose or stockings, usually ending in the guy cumming in their feet and legs

Last night, I ran into Cara and Nadia. They invited me back to their place for a fantastic double stocking wank

Double stocking wank by PhilliBlunt June 12, 2023