Top Definition
The instinctive and unexplainable urge to throw yourself into your friends fights. Inspired by the oh so awesome Jayne Cobb, of Joss Whedon's Firefly.
He hit me, I hit him, and then there was a Jayne reaction and all the Browncoats started punching.
by TashaElizabeth August 22, 2006
5 Words related to Jayne reaction

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