Poop-tank Edit Meaning

1.

Taking a shit in the water tank of the toilet so that when flushed, dump water fills the toilet bowl.

Man, this party blows! I'm not leavin' untill I poop tank this bitch.

See Masked Avenger

2.

A more direct, elegant expression of the upper decker.

Feces --> Toilet Tank --> Flush >>> Poop Tank

3.

The two-cheecked, vertically split hemi-sphere that you would be lost inside if you travelled about 6 inches aft of the vagina along the grundle.

After like half an hour of wearing the hingesoff this girl's front door, she finally got on all fours, and looked back at me with a look that said, "put it in my poop-tank or get out."

See back door, shitter, ass