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3.
When a male attempts to pull out of his partner before he ejaculates, but is not successful and blows his load in the middle of the pull out.

Man, I was hitting this girl from the back the other night, but I didn't have a rubber on so I had to do a pull out, but I didn't make it in time and Boomer Soonered inside her.
by ofj07 June 07, 2007
 
1.
1. The fight song for the University of Oklahoma.

2. A chant amongst alumni and fans of the school. When in the presence of other Sooner fans, one person must first yell "Boomer!!!" and it is the duty of someone nearby to reply "Sooner!!!". Both must be done as loudly as possible.

(Can result in embarrassment when one yells "Boomer!!!" under the false pretense other Sooner fans are around, and receives no response as a result.)
1. "Boomer Sooner! Boomer Sooner! Boomer Sooner! Boomer Sooner! Booner Sooner ! Boomer Sooner! Boomer Sooner OKU!!!!
2.
Sooner Fan 1: "Look at that guy over there...he's got a OU hat on!"
Sooner Fan 2: Awesome, see if he can hear us.
Sooner Fan 1: "BOOOMER!!!!!!!"
Guy: "SOOOOOONER!!!!!!!"
by Our Roy Williams Is Better December 07, 2010
 
2.
An embarrassing display of school pride in an inappropriate situation.

Originally the fight song of the University of Oklahoma, convicted murderer Jeffrey Landrigan chose this phrase as his last words before he was executed on October 27, 2010.
Mike pulled an awful Boomer Sooner last night when he sang our school's song as he pissed on a cop car.
by O-kay! October 27, 2010