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Tank Job 

A restroom prank or act of revenge where one removes the lid of the toilet tank and defecates in the tank before replacing the lid. The next poor bastard that uses the toilet will be greeted by bits of your stool as the bowl refills.
My boss was such an asshole today I left him a tank job to deal with. Hope he has plenty of bleach!
Tank Job by jdirtybird May 16, 2025

Sneaky Tank Job

When adorned in a full ninja costume, the act of approaching a blind civilian and swiftly inserting (no more and no less than) three fingers into said civilian's unsuspecting rectal cavity.
"Hey, look at that blind guy! I'm gonna hook him up with a sneaky tank job. He'll never know what hit him!
One of the most cruel things you can do to a person, or rather, their toilet. The TankJob can only be pulled off on a toilet that has a tank on the back (many commercial grade toilets don't have one, thus are not an option). To complete it, you must remove the lid of the tank, and crap directly into it (the source of the clean water when the toilet is flushed). A particularly messy crap is best, however, if you have the balls to pull this off, ANY crap will do. Toilet paper NEVER makes it's way into the tank during the process... it ALWAYS is to be placed in the toilet bowl, where it belongs.
Ripped up on free beer at his cousin Steve's wedding, Glen decides that the country club it's being held at REALLY needs a TankJob. It's a hard choice between that and pooping on the practice putting green (which is lit and in full view of the dining room), but the club ultimately receives the TankJob.
TankJob by SuperTanker7 October 18, 2004
An excruciating blowjob with little or no pleasure.
Bill was very upset the following morning after getting a tankjob from a girl he met at the bar.
tankjob by mythss February 1, 2009