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noun. A love term used to describe the incestrial relationship between the two Disney Channel step-brothers, Phineas and Ferb in the original Disney Channel cartoon series, Phineas and Ferb. This word is common in the fanfiction world and is the most popular yaoi couple associated to Disney Channel.
I wrote a Phinerb fanfiction!

Last night's episode was just full of Phinerb!
by TwitchMyItch October 11, 2013
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