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Another name for snake bite piercings. The rings on either side of the bottom lip serve as rails to guide a dick right into your mouth.
Guy: "Hey guys, look at my snake bites!! I'm such a hard ass!!"

Friend: "You mean look at your dick rails. You're such a fag, I bet you can suck a mean dick with those things!!"

Everyone around the conversation: "Hahahahah!!!"
by ronious October 13, 2009
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To snort cocaine off a man's erect junk.
Walking in on a girl performing this task and she replies with, "relax it's just a dick rail"
by Brealz August 19, 2008
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