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1.
A violent rage that cannot be controlled, often expressed in Tourette's-like cursing accompanied with demonic facial contortions. An angry sense of entitlement that will cause you to treat anyone around you with contempt and physical brutality, including game officials, innocent cameramen or possibly your own team.
Yo--I said I wanted those eggs over medium, I'm about to go Pelini up in here!!!! @#$%$$%!!!!!!
by Bucknell Bison November 21, 2010
 
2.
The act of getting caught disparaging your customers/supporters/fans.
Frank's biggest customer just overheard him talking shit about him. He really pulled a Pelini there.
by huskermuster September 23, 2013