Red Ass

“Red ass” means to show great anger or passion. A Texas A&M Aggie who goes out of the way to show Aggie spirit is another definition of “red ass.”
   
 
Urban Dictionary
Red Ass 
In Texas: one who is beyond being a bad ass, one who will do whatever it takes to get the job done and will shoot first and ask questions later.
Don’t mess with Johnny, he’s red ass, you know.
by Gil Jan 12, 2005
 
Urban Dictionary
a case of the red ass
classic phrase to be heard from the very very old people in the south, generally.
to mean pissed off. angry.
yo mawma sho got hahsayelf a cayas of da rayed ayss t’day.
your momma sure got herself a case of the red ass today.
by rachelgirlwonder denver, co Sep 23, 2005
 
Red Ass Apparel Co.
We Texans are a proud bunch who are passionate about our great state and our heritage.
 
Red Ass Apparel Co. was formed to complement the pride and passion we have for this place we love, our home… TEXAS!
 
The term “Red Ass” is one used to express extreme passion, enthusiasm, motivation, or even anger and rage. “Red Ass” is a term which is as diverse as the great state from which it originates.
Here at Red Ass Apparel Co., we show our ass every day and we hope you and your folks will do the same. Enjoy your visit to this website and please send it along to those you think might be interested.
 
Wikipedia: Traditions of Texas A&M University
Red-ass - A term for an Aggie that goes out of their way to show their Aggie spirit.
     
NYTimes.com - Schott’s Vocab
November 23, 2010, 2:00 pm
American Speech: The Language of Traffic Policeman (1962)
by Don Dempsey, San Diego State College
American Speech Vol. 37, No. 4 (Dec., 1962), pp. 266-273
(...)
PINK-ASSED | Only slightly angry. See also RED-ASSED.
RED-ASSED | Extremely angry. See also PINK-ASSED.
 
Google Books
Mosca: A Factual Fiction
by Richard Miller
DFI Books, Dada Foundation
1997
Pg. 79:
Thomas loved thrusting the song into this military milieu where, to use a Texas expression, it would give plenty of Rebels the red ass.
 
Google Books
Brown Shoe Black Shoe:
Memories of Two Air Forces, Two Wars and One Military Occupation
by Troy Thompson
Xlibris Corporation
2004
Pg. 250:
RED ASS—Frequently “The RA’s”. A term used by subordinates for a situation where someone superior to them seems to be especially irritated with them or even with the world itself.
 
5 April 1981, Syracuse (NY) Herald Journal, pg. B1:
“As a player, I was a red-ass. Well, let’s just say I had a temper. I was intense,” said Humphreys, a righthanded relief pitcher in his younger days, who spent parts of nine years in The Show.