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 16, 2006
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When two people are tounching when one is behind the other, and are both facing the same way.
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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!"
"ohh look theres Griffo lets BONE TRAIN him!"
by Gino D March 16, 2008
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by BananaHead88 June 6, 2021
Get the Bonebrain mug.A portmanteau of Boner and Entertainment. Something that is both sexually arousing and entertaining.
Watching the women's tennis, I became aware of bulging in my pants, I then realized I was watching Bonertainment.
by hemordroid March 21, 2017
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