Definition of "innertube" [innertube]

• In a pneumatic tire, the rubber liner that holds the air. (noun)
• This rubber liner, used without the tire on water as a flotation aid. (noun)

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• "With such materials and a boundless enthusiasm for turning interminably stored junk into stuff you don't need, I present the bitchin 'innertube wallet to solve all your wallety needs."
• "Yeah, nobody could ever make that harrowing journey -- oh, except maybe a six-year-old with access to high-tech innertube technology."
• "There's a lot that rings true in the broad-brush parts Matt Tabbi's latest screed although I take exception to the most vicious bits, like the line about Palin “having the brains of an innertube.”"