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The act of one person taking a dump normally on a toilet while another person sits on their lap facing them and takes a dump through the space between the first persons legs.

A tandump can be performed either consensually or by ambush. In an ambush tandump, the assailant initiates a tandump by climbing over a stall wall and dropping down onto the unsuspecting pooper.
Ari: Hey Jacob, wanna take a tandump with me??
Jacob: Yeah of course! I call dibs on bottom!

************
Joe: Mike, why did you and Elaina break up?!?
Mike B: Her ex, Josh, told me that she really enjoyed tandumps, so I decided to surprise her with an ambush tandump! She threw up on me and threatened to call the police...
tandump by AmericanSwagSociety December 9, 2010
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He made 10 tanimos in his email, I cannot read it
tanimo by sidm1 February 13, 2014
Related Words

Pulling A Tanim 

Collapse for no apparent reason in a dorky fashion
Oops! I'm pulling a tanim, now ima die.
Pulling A Tanim by Falcon Fyre December 2, 2014
Clever:
Possessing quickness of intellect, skill, dexterity, talent, or adroitness; expert.

you are tanim as a fox.
tanim by blassd March 16, 2009

Tanimest 

the new word for manifest because manifest word is annoying...love u universe
i tanimested $1000
Tanimest by yeslookuglie July 3, 2020

Tanimura'd 

A word that refers to a homie who magically disappears one day, without any sign as to where said homie went. The word originates from Yakuza protagonist Masayoshi Tanimura, who only appears in Yakuza 4, and is only even referred to again in Yakuza 5, before the secret boss fights.
"Hey what the fuck happened to John?"

"I dunno Mitch, though it's clear as day that he got his ass Tanimura'd. It's a shame, since he was the sole reason as to why we were able to get those Mousekatools."
Tanimura'd by Dong expanded August 22, 2021
An Asian man, when in the presence of a naked woman, transforms into large werebeast and proceeds to fuck the shit out of that woman.
Person 1: "So, how was it last night?"

Person 2: "It was great, I turned into a real Tanimal last night!"

Person 1: "Dude...."
Tanimal by @TheRealTanimal October 20, 2013