Top Definition
The act of spontaneously vomiting a rainbow, most notably when an individual’s level of thankfulness and/or excitement/joy in regards to being thankful reaches an overwhelming level. It is the highest level of thanks one person can give to another.
Thank you so much. This is so awesome, I could just rainbow ralph.

Kenneth was so excited, he rainbow ralphed.
by justWink May 16, 2011
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