After losing to Matt Hughes, George St-Pierre stated he was not impressed and wanted a rematch. However, he did it in the most polite way which is typical of GSP.
Joe Rogan: "Here's Georges." Georges St-Pierre: "I'm very glad you won that fight, Matt, but I'm not impressed by your performance and I look forward to fighting you in the near future."
GSP is not impressed
Early in Dustin Poirier's career his hair was in a buzzcut, but at some point he grew his hair a bit and added a little bit of style, saying that one advantage he has over his opponents is that his hair is "Salon Quality". UFC fans believe Poirier has performed better since receiving his new haircut, and have nicknamed the new iteration of Dustin "Salon Quality Poirier".
Dustin Poirier: "I'm a better boxer, I can scramble better, better Jui Jitsu, longer, faster, I can dance better, better looking, my hair is salon quality."
UFC Fight Night Calgary: Camino al Octágono
For situations when a fighter is losing very badly and appear to be taking damage with no chance of winning, and yet the referee does not stop the fight, the ref is assumed to be thinking "If he dies, he dies". Originally referring to referees Mario Yamasaki and Steve Mazzagati who are notorious for letting one-sided beatings go on too long.
3 Minutes of Mario Yamasaki Forgetting That He's The Guy Who's Supposed to Stop the Fight
3 Minutes of Steve Mazzagatti's Most Bonehead Calls
Between rounds of Melvin Guillard vs Ronys Torres at UFC 109, a bag of ice cubes broke inside the octagon spilling all over. Officials tried to hastily clean up the ice, but knocked over the collection bucket, re-spilling the ice several more times. Then they attempted to sweep the ice through the side fencing and nearly left ice in the cage before starting the next round. Joe Rogan was on commentary and hilariously made fun of the ice situation.
Joe Rogan: "Wow look at all the ice all over the octagon. Oh that's a problem, someone spilled ice in the octagon... (about the cleanup effort) they knocked the bucket over, three stooges, what are you freaks doing? Everybody's booing."
Joe Rogan vs The ICE Spill
Originally popularized by UFC fighter Khabib Nurmagomedov, "Number One Bullshit" is something he would say to express dislike, disdain or disapproval for a person or situation.
Khabib Nurmagomedov (on Conor McGregor getting a lightweight title shot before he did): "This is number one bullshit."
Khabib Nurmagomedov This Is Number 1 Bullsh!t
Chael Sonnen makes fun of the Brazillian Nogueira brothers. Sonnen claims the Nogiera brothers, new to America, had never seen a bus before and thought it was a horse, and thus tried to feed a carrot. The story has remained a favorite in MMA fandom.
"I was in Las Vegas when the Nogueira brothers first touched down in America. There was a bus that pulled up to a red light and Little Nog tried to feed it a carrot while Big Nog was petting it. He thought it was a horse. This really happened." - Chael Sonnen
Chael Sonnen - Nogueira Bus/Horse Incident [v3.0]
Big Nog on Chael Sonnen Saying He Fed a Bus a Carrot
"Skinny White Boy with One-Punch Knockout Power" is a reference to UFC 135-pounder Sean O'malley. He is tall and lean for the division, but has some of the most devastating walk-off knockouts in UFC history.
Derp: "Why do people like O'malley so much?" Derp2: "Because he's a skinny white boy with one-punch knockout power. His fights are exciting - you never know when he's going to drop his opponent."
Skinny White Boy with One-Punch KNOCKOUT Power | Fight Words