Shit Stacking 

When one shits on the ground, and another shits on top of the original shit. Usually very steamy and mountainous.

C-Mac: "Someone took a steamy shit on the floor!"

Tony: "That is one big shit, it looks two things did it. Some people may be Shit Stacking."

Shit Stacking by Mustafa_Raza_ July 18, 2012

Clam stacking 

When multiple women are stacked on top of each other and a guy fucks a new hole each thrust.

He was totally clam stacking those women from the bar

Clam stacking by Goldfish_Vender May 6, 2019

Shiva Stacking 

In the popular zombie-horror first person shooter video game Left 4 Dead, survivors oftentimes employ a tactic knows as Shiva Stacking/Survivor Stacking, where all the survivors crowd into a corner and begin melee spamming.

This tactic is known as Shiva Stacking because of all the arms/rifle buttstocks protruding from what oftentimes appears to be one body mass.

The only way to trump survivors who are Shiva Stacking is to introduce a Tank.

The Survivors were Shiva Stacking in a corner during the Death Toll Finale, and not one of us could get a pounce on them or nothing.

Shiva Stacking by xl_VLCMSTND_lx August 16, 2009

Log Stacking 

When you put two penis' next to each other

I heard you and Greig were log stacking last night

Log Stacking by KillerCarlson July 22, 2015

clan stacking 

Clan stacking is a situation in online team gaming where one team consists of players that are part of one or multiple clans while the other team consist of random players(PuG). The players that are part of a clan will usually dominate the players that aren't because they can coordinate and communicate. Clan stacking if frowned upon because the majority of online players don't belong to a clan. Some games/servers prevent clan stacking by spreading the clan players out over the teams.

Our team is being dominated by a clan stacking team in BF4.

clan stacking by alter3483 April 4, 2016

ticket stacking 

Whenever shit head servers do not know how to do their job.

You have only one job, stop fucking ticket stacking!

ticket stacking by Pissedoffcook July 20, 2017

Crap Stacking 

When one person is seated on the toilet and another person sits on that person's lap and craps through the first person's legs. Usually occurs in dorm rooms housing excessive occupants and there's only one toilet.

"Open up your legs" Cassie pleaded. "I really have to go"!

Scott objected, stating "I do not engage in crap stacking!"

Crap Stacking by Pfc. Snowball August 14, 2008