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when more than 3 guys make an anal sex train. grinding in and out of each other's anus like a locomotive. the guy in front is called the conductor.. all partneers thereafter are called cabooses.
"dude, i was at that gay club the menagerie the other night and these 5 guys were having a wicked crazy bone train."
by valme February 15, 2006
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Apr 21 Word of the Day
I've been jabbed
by Francesco II March 20, 2021
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2
It's when someone runs into someone from behind

Or

When two people are tounching when one is behind the other, and are both facing the same way.
"ohh look theres a man boning a sheep lets BONE TRAIN it!"

"ohh look theres Griffo lets BONE TRAIN him!"
by Gino D March 16, 2008
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