Double Stacking Edit Meaning

1.

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!

2.

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!