Backdoor Trojen 

A man who likes to have anal sex with others without consent

Owen is a backdoor trojen, just yesterday he tried to rape me up my bottom

Backdoor Trojen by Funky Spunky Monkey Junky August 26, 2007

backdoor trojan 

A Trojan is a program which infects a computer and allows a hacker to gain entry by one form or another.
A Backdoor Trojan is one which allows sets up some kind of server service on the computer for hackers to channel data through

It is also a slang term for a gay person who likes to give another gay person a big one up the bum

Example 1
Straight IT worker: Hey theres some kind of trojan affecting the server. I hope its not a Backdoor Trojan.

Gay IT worker: OOh I wouldnt mind it, as long as its a big one.
Example 2
Gay guy: Oooh you know that guy we met last night, ooh he turned out to be a Backdoor Trojan, yes, he was at the backdoor trying to screw my data out all night long. I can hardly walk

backdoor trojan by Edgar Allen Post September 22, 2006

back door trojan 

The sexual act of hitting it doggy style then pulling out and ramming it in the back door.

Dude remember that slut I met at the club? Totally pulled a back door trojan on her. Don't think she will add me on Facebook now.

back door trojan by DasCracka January 26, 2011