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1.
When a guitar/bass guitar is so heavy on the neck and headstock, that the body just cant match the weight, and the neck dips down when playing. Just like Gibson guitars (firebird, x-plorer, flying V, SG, Les Paul) are famous for.

"Dude, i just got a B.C. Rich Warlock."
"How is it?"
"Good sitting down, but standing up playing, its got fuckin' Gibsonitus"
by Pat the bassist April 14, 2009

Words related to Gibsonitus

bass dip gibson guitar neck