Sinside 

Being sad on the inside but not showing it on the outside.

Person 1: Hey man, I've always wondered what goes on in your head
Person 2: Not a lot, I'm just sinside.

Sinside by 2Realest June 3, 2018

Sinsine 

sinsine

is a passionate, motivated and beautiful girl.

she's upbeat, positive, and playful who enjoys living
life to the fullest. she's one of the best person to be around.

Sinsine is so much more than a pretty face

Sinsine by Nostalgiasi November 24, 2021

there’s more to a cake than what’s inside 

When the final product is better than the original ingredients.

He really made that team sing. You know what they say, there’s more to a cake than what’s inside.

there’s more to a cake than what’s inside by twattry January 1, 2019

Mario and luigi bowser’s inside story 

Official nintendo vore, also a very good game

Hey, did you see the game mario and Luigi bowser’s inside story, it’s pretty much officially licensed nintendo vore!

Mario and luigi bowser’s inside story by Scorchys September 23, 2020

scored the sinslide 

This can have two meanings. One is simply and FINALLY getting to having sex with someone you have wanted to for some time after overcoming many obstacles. The other meaning is rating the act of the sinslide afterwards.

Willie: I finally got to scoring the sinslide with Rach!
Bronk: Well, from the sounds of it you are stoked to have finally scored the sinslide, but seems like you would have scored the sinslide with a positive rating!

scored the sinslide by von groovy September 15, 2017

Mario and Luigi Bowser’s inside story 

The best Mario game ever made.

Mario and Luigi Bowser’s inside story is the best Mario game
You’re spitting facts

Mario and Luigi Bowser’s inside story by Voltron77 September 30, 2023

Stinsides 

When you wear shorts and a t-shirt indoors (typically in a dorm) when it's really subzero outside during the winter. A concatenation of "stay inside"'s.

"Why are you wearing beach shorts when it's 8 degrees outside?"
"Too lazy to put on pants since I just going downstairs to pick up Chinese delivery, so I've got on my stinsides."

Stinsides by wxs December 21, 2009