A T-Spin is an epic spin (not a simple flip, though) sometimes done by SimpleFlips while playing Tetris.
T-Spins are rotations of the T-Tetromino, while spinning the tetromino into a tight gap that's normally not possible by normal physics, Thankfully due to how rotating works in Tetris, it abides by the laws of physics. Some people have deduced that maybe the T stands for TJ "Henry" Yoshi, Tingle, sillicone Toys, Tape, and TUP, but all of these save for TUP (or maybe not) are false. It always refers to the shape, the taste, and the texture.
Despite the apparent lack of humor in T-Spins, they're considered a joke, for it is a relevant enough move in SimpleFlips' arsenal that they have obtained an BUP-themed emote (named SimTUP) and are often the source of many combos big enough to boost the legend himself to the very top of the leaderboard.
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