tandump 

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

tandum stroke 

In a circle jerk, when you use one of your own hands and the hand of the individual next to you.

Me and my bros had a great tandum stroke last night!

tandum stroke by Beartrap, Batman, butt bandit July 11, 2019

tandum 

the image created by another object when using the formula hinting to the "eagle eye"

"class, now find the tandum of this box"

"its so easy,just use the tandum!"

tandum by dorsalfinn456 April 8, 2009

spray-tan dump 

When you ask your girlfriend who has cheated on you with 4 or 5 guys, and has admitted to eating two of her ex's assholes, to have anal sex, and you stand on the bed and piss on her, dump her, and taze her with a 1,000,000 volt from cabela's in the back, pre-emptively, and file a restraining order against her.

I spray-tan dumped Kimberly last night because I found out from one of the guys on the baseball team that she did a tug-brothers with Nick and Paulie.

spray-tan dump by thechri5 March 1, 2019