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1.
The act of delivering an inexplicably disappointing performance, usually within the context of a college football season.
Oklahoma State's overtime loss to an unranked Iowa State was a full-blown Clemsoning.
by solidverbal November 21, 2011
 
2.
1. The act of failing miserably on a grand athletic stage, or when the stakes are high. 2. Record-setting failure, usually reserved for college football.
There was an epic example of clemsoning when Clemson hosted Florida State in a highly anticipated football game on October 19, 2013. Clemson was ranked 3rd, while Florida State was ranked 5th. Florida State won the game 51 - 14. Clemson set a NCAA record for margin of defeat by a home team ranked #3 or higher. The 51 points scored by Florida State is the most points ever allowed by a Clemson opponent on Clemson's home field. Most of the home team fans could not take the clemsoning any longer and left the game mid way through the third quarter.
by Titleist2001 October 20, 2013
 
3.
(verb) 1. When you are widely favored to succeed and instead crash & burn. 2. Failing miserably and/or by a wide margin 3. Horribly embarrassing yourself in front of loved ones and strangers alike. 4. Having multiple records broken against you in front of a large audience.
1. When Google Plus launched it took a real Clemsoning. 2. When the hare raced the tortoise he really got Clemsoned. 3. When Snooki's parents decided not to have that abortion, they really pulled a Clemson.
by 5Speed January 10, 2012
 
4.
In college football, beating two top-ten ranked SEC teams in a row or beating multiple ranked SEC teams in a season.
I can't believe how the ACC is Clemsoning the SEC this year.
by JessePalmerDoucheBag September 20, 2013