SIU

SIU = Southern Illinois University, located in Carbondale, Illinois. Home of the Salukis!

SIU basketball dominates the Missouri Valley.

SIU is one of the top party schools in the nation.

by Grey Dawg November 05, 2009

SIU

An acronym for "suck it up"

Person 1: Ow, I bumped into that wall.
Person 2: Man, SIU go beast it

by Lynbrook Viking April 04, 2006

SIU

Acronym for Special Investigation Unit for law enforcement/prosecutors and insurance compaines

When that boatload of coal claimed whiplash, they called SIU in to videotape them playing basketball

by Teabag April 24, 2006

SIU

Acronym for 'step it up' meaning for one to reach a new/higher level then previously on.

Commonly used in forums and online gaming.

Guy 1: Dude, your bottom of the team. SIU

Guy 2: Hey, I'm new, I'm trying my best okay!

by Charlag November 14, 2011

SIU

Just siu...

SIUUUUUUUUUUUUUUUUUUU

Wow that was a good sho-

SIUUUUUUU

Did he just have a stroke?

by Siu to the dude February 27, 2022

SIU

A word the world of football/soccer use all the time. It is known by a player called Cristiano Ronaldo that makes that sound whilst doing his celebration after scoring a goal.

Ronaldo: SIUUU
Fans: SIUUUU

by Definition Merchant January 23, 2022

Siu

A celebratory expression often used by Cristiano Ronaldo after scoring.

SIIIUUUUUUU.

Siu

“That food was banging love”….. SIIIIUUUUU

by Brown dog December 12, 2021