C O O L was used whenever SimpleFlips said the word cool in a Super Mario 64: The Green Stars TAS stream[1], to which he would say cool a lot, and people would say C O O L afterwards, mocking him for not being able to come up with adequate wording. They also did this for any other describing word he used, like C L E V E R, or A W E S O M E.
Channel Jokes
1, 2 Oatmeal · 200 IQ · Abandoned Children · Adhesive · BUP · Eediot · Fred · Gay Baby Jail · I Can Fly · Ram Ranch · Roxanne · Shoutouts to SimpleFlips · No Cock Like Horse Cock
Stream Jokes
50-50 Grind · Banger · C O O L · Companion P · First Try, Idiot! · Great Entertainer He Is · SimpleFlips Screaming · Speedrunners Hate Him · T-Spin · Garbage
Cursed Bangers
Banger · 1, 2 Oatmeal · Ram Ranch · Roxanne · SimpleFlips Screaming · No Cock Like Horse Cock · I Can Fly
Community Jokes
0.5x A Presses · Aching Tentacles · Bomb Clip · Counter · Dad · Need it as my Ringing Tone · Owless · Press A To Be Gay Today · Pringles Can for $100 · Releasio 64 · TJ "Henry" Yoshi · Toss Your Salad · Unmod Ben · Robot 64
Narrators
Carlos · Harry · Narrator vs Text-to-Speech · SimpleFlips' Narrator
BLJ
BLJ · BLJ the Thwomp's Cock · God-BLJ · IRL BLJ
ROM Hacking Jokes
Green Demon · Invisible Walls · Lava · Lazy Texture Packs · Out of Bounds · Quicksand · Reverse Polygons · Teleportation· Chuckya· Horrifying BUP Abominations
Minus World
Nathaniel Bandy Everytime · Scuttlebug Bandy · Striving for Originality