Kerbal Space Program 

Kerbal Space Program is an indie space-sandbox game known for it's steep learning curve and accurate physics simulation. Many players were originally turned off by the "rocket science" aspect of the game. A phrase popularized by the game is "Add moar boosters" and it has been mentioned on xkcd.

Hey, Bob, I'm having trouble with Kerbal Space Program.
Bob: ADD MOAR BOOSTERS!

Kerbal Space Program by waterlubber June 27, 2015

kerbal tunnel 

Kerbal Tunnel is when you get sore wrists from playing Kerbal Space Program for hours on end.

Man, ever since I got weekends off I've had Kerbal Tunnel from spending all damn day playing Kerbal Space Program.

kerbal tunnel by The Keasbey Knight March 27, 2015

Kerbal Space Program 

Kerbal Space Program is an alien torturing game made by Mexican-based company, Squad. You play the game by building phallic rockets and trying to get your little green turds, or Kerbals as the game calls them, into the cold, dark emptiness of space trying to get to other planets. Playing Kerbal Space Program regularly will make you more qualified for a job at NASA than actually going to school.

NASA boss: So why would I hire you for this job?

You: I play Kerbal Space Program

NASA boss: *Startled voice* Of course, right this way!

Kerbal Space Program by FrailFlunky99 November 10, 2020

Kerbal Space Program 

An amazing spaceship building simulator that got some bad reviews because the devs updated the EULA and some people read it wrong. Developed by Squad and published by Private Division

Kerbal Space Program in a nutshell...
Kerbal #1: Hey, what if our ship exploded mid-flight?
Kerbal #2: Don't worry, it was well designed.
Narrator: It was not well designed...
Ship: *explodes mid-flight*

Kerbal Space Program by Lilhappi June 14, 2018

kerbal space program 

The hardest game ever made.

I'm going to play Kerbal Space Program!
*seconds later
FFFFUUUUUUUUUUUU

kerbal space program by Jedediah is Gone! October 26, 2013

Kerbal Space Program 2

The best game that you dream of which will never release.

Hey is Kerbal Space Program 2 released yet?
No it is delayed until 2023
Hey is Kerbal Space Program 2 released yet?
No it is delayed until 2024
Hey is Kerbal Space Program 2 released yet?
No it is delayed until 2025

Kerbal Space Program 2 by Matt Free March 9, 2021

Kerbal Effect 

The Kerbal Effect: when a videogame inspires a person to pursue a career path that they had not planned on before, named as it is because of the many people that have pursued degrees in aerospace engineering because of Kerbal Space Program.

I just saw another Kerbal Effect post on Reddit where someone got degrees in aerospace and mechanical engineering because they bought KSP.

Kerbal Effect by VaporizedKerbal July 1, 2022