Sigma Balls 

a cult on twitter where each member is depressed, emo, gay, obsessed with the #1 anime (Bungo Stray Dogs) and hotter than anyone else on Earth

- Sigma balls matching balls 🥀⛓
- “Someone sent the :} Chuuya photo” “Oh they were probably from Sigma Balls”

Sigma Balls by stanlee August 8, 2021

Sigma Stare 

An unsmiling direct stare

Capybara, Leorio, Adachi, Omni-man and more:*sigma stare* okay i pull up

Sigma Stare by The mochi gabs 12 September 18, 2021

Sigma Phi Everyone 

The unofficially official nickname of the fraternity Sigma Phi Epsilon, who are known all around the country for taking in anyone and everyone they can. They just like to brag about how they are largest as they take all the douches on campus. They also are famous for giving bids to those losers who get rejected by other fraternities.

John: Oh my god! How come losers douches like Jim and Tony are in Greek life on campus?

Kevin: They are in Sigep: Sigma Phi Everyone......

Sigma Phi Everyone by realgreek November 23, 2010

Sigma variant 

The SARS-CoV-2 variant that comes after Omnicron.

Reporter: February 24, 2022 — experts have detected sightings of a new SARS-CoV-2 variant in the outskirts of Bangkok. They are naming it the Sigma variant because it sounds more cooler than Rho or Tau.

Sigma variant by Mary Mary Quite The Contrarian December 24, 2021

Sigma Furry 

a Sigma Furry is someone that is identified as a furry to have common sense and maturity like a normal human adult

Pop is a Sigma Furry for that

Sigma Furry by Mvinje May 27, 2023

sigma bond

why tf are you looking this up on the urban dictionary. Ill tell you anyway.

Its any type bond found between two atoms. Even double bonds and triple bond are sigma bonds but with the addition of 1 or 2 pi bonds

H-Cl-H. O-C-O
2 sigma bonds 2 sigmas bonds

No gtfo and look for a reliable source of info💀

sigma bond by Jaja06 October 8, 2023

sigma juice 

something you say when you think something is very cool and swag

Dad: hey son, me and your mother are getting a divorce because of you
Son: Sigma Juice!

sigma juice by YesIsOverUsed October 25, 2023