Literally meaning the ass hole and how a person has never had anal sex. Behind-a-hymen denotes a person male or female, being a virgin to anal sex. Therefore, not having their ass (behind) hymen broken.

Adam Carolla was the first person to coin this term on his morning radio show and has used it a number of times.
Josh: "I tried to have anal with Teresa the other night and she got super pissed at me."

Corey: "No way!! She still has her behind-a-hymen at 24? There's just no way!"
by Ms. Lacuna April 26, 2009
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Sara thinks Kanye West is the best rapper ever. She's such a fucking left behind.
by Iscariom November 10, 2016
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When a guy ejaculates in a person's mouth and that person has braces.
Person 1: hey, I was with Kayla last night and I blew it in her mouth. She's nasty.

Person 2: wait you left her suck your dick?
Person 1: yeah, I know, its risky with her braces but she didn't cut me up at all. I just put my seed behind bars.
by Gator 8er February 19, 2020
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When you take a dump and do not flush. This forces the next person that comes along to see your dump.
I did a leave behind at work today. Everyone was taking about it. It was awesome.
by Gpack25 April 11, 2016
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as i close my eyes, i feel it all slipping away

we all got left behind, we let it all SLIP AWAY!
by tha truth teller July 25, 2006
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When a girl is grinding on a and puts her hand behind her back into his pants delivering a blowjob.
Hey Katie i was totally dancing on this guy and have him a behind the back!
by noochinator March 28, 2011
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