Squidward looking out window refers to a reaction image macro, depicting Squidward from SpongeBob SquarePants looking out from the shadow of his room to SpongeBob and Patrick as they are visibly having fun.
The image macro is used online to express one’s jealousy at seeing others enjoy themselves, while participating in something one cannot join.
“Squidward looking out window” is seen in the Season 7 Episode 144 of SpongeBob SquarePants, titled “That Sinking Feeling” which was first aired in the US on July 8th, 2010.
It was first used as a reaction image on Tumblr in December, 2013.
The meme format quickly spread to Twitter where it appeared in a large variety of edits, with captions as well as object labelings, making “Squidward looking out window” an exploitable meme.
It also emerged on other social media sites, including Reddit, Facebook and Instagram.