USACO 

USA Computing Olympiad
Most commonly pronounced as: You-Suck-Oh (or less commonly; You-Sack-Oh)

A 4-hour long, online programming competition for highschool kids where there are four divisions: Bronze, Silver, Gold, and Platinum. Each division features different types of problems, such as sorting, binary search, DP, greedy, graph theory, blah blah, etc.

Helpful Side-note:
Once you reach the 4th division (Platinum), you will realize that the pronounciation of the name makes sense.

Gaddamit, I forgot ONE edge-case for my program, and that killed 8 test cases!! Gaddammit, I missed the USACO Platinum cuttoff by ONE test-case..... Gaddammit, my code won't even compile!!

....I realized that I was a USACO(You-Suck-Oh).

USACO by usacokiddo January 11, 2018

USAC 

USAC; (United States Auto Club), is an open-wheel auto racing sanctioning body for Mopar Midget National Championship, Sprint Car Series, Silver Crown Series and Ford Focus Series.

"Formula 2 races are governed by the USAC sanctioning body."

USAC by aliaz May 15, 2010

USAMO 

United States of America Mathematical Olympiad. It's a contest for the top 200 or so high school mathematicians in the country.

Only geniuses can qualify to take the USAMO, never mind win it.

USAMO by Johnny Estrada August 28, 2006

ustacould

Was once able to.

Well, I ustacould. Give me a minute and I mightcould again.

ustacould by A.B.S. May 24, 2004

Usako 

1. Japanese name meaning "bunny child".
2. The online alias of a popular fan sprite artist for the game Ragnarok Online.

Her name is Usako because she was born in the year of the rabbit.

Usako by Usako December 28, 2007

USAMO 

A difficult, prestigious math competition for the students with the top AMC + AIME schools in the United States. Simply qualifying for the exam means that you're among the best in the nation.

Thomas Jefferson of Science and Technology has more USAMO qualifiers than any other school in the United States.

USAMO by inquilinekea July 15, 2008

Ustacould

(redneck word)slang for being able to do something at one point and time.

Shaun: Well, can you drive?
Jim: Well I ustacould, thanks to that one time we tried to be Nascar drivers in parking lot.

Ustacould by TrunkKids friend December 7, 2006