USI

Unwarranted Self-Importance.

To make yourself seem important without actually doing anything to benefit society.

Typical USI sufferer-
"Hey guys!! i just posted an awesome new drawing on DA, and then i posted a vlog on YouTube about what happened to me today! i also talk about my new band! i'm putting some vids on my channel cuz i know we're gonna make it big! i also just put up some new pictures of me on my Myspace (lol i dyed my hair, i look so HAWT!!!) comments PLZ THX GUYS!!! <3"

by Peter W.N. October 30, 2009

Usi

Another word for “brother” or “sister” in Tongan.
Its better saying “Usi” sounds more better and respectful.

Hey there Usi!
Wanna fight Usi?

by Liki Me April 12, 2021

Usi

The most beautiful island flower located in the South Pacific regions which include America Samoa, Fiji, and Tonga.

Damn, that’s a really pretty Usi right there.

by Buttplugger69 December 31, 2019

USI

Unidentified Sex Injury
Those bruises, cuts, muscle strains, and torn ligaments that happen after a night of vigorous sex - and you cannot remember exactly what you did to cause it.

"Holy crap! My one leg is completely covered in bruises, but I don't remember what we were doing and how it got that way!"

"Dude, that is a serious USI."

by Gigii June 22, 2008

USI

USI or Unidentified Sleeping Injury. Any new, idiopathic physical pain, ache or discomfort that you did not have when you went to sleep, but appears upon or shortly after waking, and for which there seems to be no apparent cause, such as recent trauma, injury, illness, effort or activity. USIs become significantly more prevalent after the age of 40. Often renders the sufferer extremely grumpy, and usually at levels disproportionate to the actual discomfort being experienced. This is because, at least in part, the advent of a USI reminds the sufferer that they are getting old, and their body does not work as well as it used to, when they were younger. Known to affect most human beings over time, no matter how healthy, fit or athletic they may be. Data on other fauna is not available, as they do not have voices to complain with if or when such a discomfort occurs. Most USIs resolve themselves within 24 hours without the need for any kind of medical or other intervention. Anything that persists beyond that time should probably be investigated, however, as the self-diagnosis of a USI may have been incorrect.

Ow! I appear to have a USI in my shoulder. That wasn't there yesterday, dammit.

by Xcalibur594 February 24, 2022

USI

USI or Unidentified Sleeping Injury. Any new, idiopathic physical pain, ache or discomfort that you did not have when you went to sleep, but appears upon or shortly after waking, and for which there seems to be no apparent cause, such as recent trauma, injury, illness, effort or activity. USIs become significantly more prevalent after the age of 40. Often renders the sufferer extremely grumpy, and usually at levels disproportionate to the actual discomfort being experienced. This is because, at least in part, the advent of a USI reminds the sufferer that they are getting old, and their body does not work as well as it used to, when they were younger. Known to affect most human beings over time, no matter how healthy, fit or athletic they may be. Data on other fauna is not available, as they do not have voices to complain with if or when such a discomfort occurs. Most USIs resolve themselves within 24 hours without the need for any kind of medical or other intervention. Anything that persists beyond that time should probably be investigated, however, as the self-diagnosis of a USI may have been incorrect.

Ow! I appear to have a USI in my shoulder. That wasn't there yesterday, dammit.

by Xcalibur594 February 24, 2022

mata usi

tongan word for shit face.

shut the fuck up you mata usi.

by J.Kickz February 17, 2004