When he stacks his testicles on top of eachother and wraps them with saran wrap to hold them in place, creating a replica of a second penis. Recommendation: Use your new ballsack-stiffy to penetrate her while also having anal sex for a double dong combo. Recommendation #2: When he can't get hard and his man meat slightly resembles mashed potatoes filled inside of a rubber glove finger, ask him to stack and sack you instead.
He surprised her by filling both of her holes after he stacked and sacked himself to create a scrotum-sword for penetrate in her punany while he also shot the club in her brown starfish.
by Tiffany MashPotatoes May 26, 2020

by Joser1207 August 20, 2017

by mr 200,000,364 January 26, 2022

This kid is the poon slayer he's slays more poon than anyone else. Then when the hoes leave him they miss him because he was the master of slaying their poon
by BbvvbOdis July 16, 2016

When someone has a gun with a lot of ammunition,or a very large gun with a lot of ammunition that they carry with them. (You wouldn’t want to mess with someone if their shelli is stacked)
dont test him got a stacked shelli
Or
Don’t worry if them niggas run up are shelli’s are stacked and we’ll clap em’
Or
Don’t worry if them niggas run up are shelli’s are stacked and we’ll clap em’
by YungboibandzTV May 21, 2018

Stroke Stack: a large collection of adult magazine (e.g., Playboy, Penthouse, Oui) that were usually hidden from your mom; magazines collected for the purpose of masturbation.
by TooSick4U February 4, 2021

when latinos climb on eachothers shoulders to reach a higher place, specifically for graffiti tagging
Guy 1: "Ey foo', we should hit up 'dat overpass."
Guy 2: "Shiii foo', hop on my shoulders. We gotta 'cholo stack', dawg."
Guy 2: "Shiii foo', hop on my shoulders. We gotta 'cholo stack', dawg."
by ReaperofLoco818 May 13, 2025
