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1.
When a person (normally a Regan) completely modifies/ changes a story or series of events with their self destructive narcissistic personality, making it completely and utterly unbelievable.
I was walking my dog yesterday and sore a rainbow.

The Reganified version would be something like: I was walking my unicorn yesterday and there was a shower of rainbows, then a magic carpet appeared and I went for a ride with all my new unicorn rainbow friends. It was totally awesome, then we had ice cream and I was totally tripping balls.
by Monky Magic for Gold November 24, 2010
 
2.
To display narcissistic or extreme self centred behaviour with no grip on reality.
Yesterday my unicorn stopped producing rainbows and all day I had to listen to Paul get more and more reganified about how he was being left out and how it was deliberate.
by Monky magoc 4 gold April 28, 2011