1. to unnecessarily defame or put down another person for no other reason than that it gets you attention

2. to lie with a total discord for truth

3. to shout someone down or talk over them, despite having nothing worthwhile to say.
Immature people tend to start Bill O'Reilly-ing instead of forming a real thought or opinion.
by DarkEdgeDash February 16, 2007
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Often Bill O'reilly syndrome is associated with some impairment of cognitive ability and a particular set of facial characteristics. Individuals with Bill O'reilly syndrome tend to have a lower-than-average cognitive ability, often ranging from severe to moderate disabilities. The average IQ of people with Bill O'reilly syndrome is around 50. To date, only one case of Bill O'reilly syndrome is known.
Doctor: "I'm sorry to say your child has been diagnosed with Bill O'reilly syndrome"
Mother: "Should we put him down?"
Doctor: "That would be best"
by jesussavesmoney March 31, 2011
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To fabricate or deny evidence/well documented/easily referenced facts in order to demonize non-American style neo-conservatives, non-Americans, or anyone with whom an individual does not agree.
"I'm not surprised you'd dismiss a 'Frontline' report out of hand, John. You'd lie like O'Reilly if it meant appearing to win an argument."
by Daniel Ponech July 7, 2005
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