A roll of fat, usually on a girl, that flops over a tight waistband and completely encircles the midsection, giving the effect of hiding an inner tube under the shirt. Particularly bad cases have been seen in which the inner tube is present even when there is no tight waistband for it to flop over.
Wow, check out the inner tube on Melody! I hope she's headed to the beach.
by jen20pigcat April 1, 2007
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An archaic car part that has been made mostly obsolete by tubeless tires. These days an inner tube is much more useful for floating on water, or for sledding on snow. It's a lot more fun that way too.

It's soft, inflated, donut-shaped, usually black, and frequently has patches glued to it where it had leaked.

Smaller versions may still be found in many bicycle tires.
I was shocked when I took that tire off the rim, and found an inner tube inside it.

Watch out for the stem of that inner tube. If you break that part, there's no patching it, and it can leave a nasty scratch on your skin too.
by Downstrike August 16, 2006
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1. Designed to be used by young men as a sex subsitute.
2. Can also be used to inflate bicycle tyres.
I don't have a girlfriend because I'm very shy, but I have a bicycle inner tube.
by soreofhing July 6, 2009
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A rusty inner tube is a sexual act in which you preform a rim job on a persons butt hole immediately after they go poop, before they wipe.
I licked sally's asshole after she pooped and it looked like a rusty inner tube.
by rusty 1 October 12, 2015
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The fat or collection of fatty deposits residing in or around the waist area resembling the shape of an inner tube. These "tubes" can have various sizes or widths depending on the total number of years worked in an office environment without the proper muscle strengthening exercises to counteract this development.
He went from working on his feet all day to working in an office 40 hours a week, and as a result he got an "office inner tube."
by indieboysf August 3, 2011
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The act of putting your penis behind the knee of a girl and have the girl wrap around your body.
i went to her house and we went inner tubing. we had a great time
by theblackguyatlunch April 13, 2011
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A persons inner reflection of themselves. Especially if they are self conscious.
Example: did you see how she kept pulling down her shorts?!
"yeah her inner tube was showing!"
by youngjok April 26, 2013
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