Top Definition
When you have a sex train going and there are not enough people to make a full circle. The person in the rear is referred to as the loose caboose.
My swinging friends invited me over for a party. My girlfriend won't go. It is throwing off the numbers for the sex train. I hope I get to be the loose caboose rocking the train.
by StyxxxCA September 27, 2009

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used to refer to a person with a loose anus. Usually happens when said person has participated in copious amounts of anal sex.
"Sally said we have to stop doing anal because she is starting to get a loose caboose."
by Anal Jim April 06, 2011

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1.) Being an anal sex fiend. 2.) girl that is an anal slut
Damn, she's a real loose caboose.
by Trigga Bone May 08, 2012

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Scot of the WCHL.

Yeah, one "t".... he doesnt seem to like things that come in pairs, aside from balls.
"Since Wednesday ol' Loose Caboose has set a new record for most men on board..."
by Canadian Pacific April 21, 2005

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Lotsa space for your liquids.

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The Urban Dictionary Mug

Your favorite word on a white mug.

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The Urban Dictionary Mug

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The Urban Dictionary T-Shirt

Soft and offensive. Just like you.

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The Urban Dictionary T-Shirt

Smooth, soft, slim fit American Apparel shirt. Custom printed. 100% fine jersey cotton, except for heather grey (90% cotton).

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