An additional rail usually found in subway systems, running parallel to the existing tracks, and sometimes slightly elevated. The third rail carries a live electric current which is used to power the subway trains.
by Mr. X-106 August 29, 2004
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A dangerous area of discussion, a point at which the mere mention of a subject result is disaster. Commonly used in politics.
"Social security is the third rail of politics. Step on it and you're dead."
-The West Wing
by Crinkle Fantastic May 5, 2005
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an expression of rage or frustration; a desire to see something destroyed (as in electrocuted on the third rail on a rail track)
"God, this guy is really pissing me off... I'm about to go third rail on this asshole."
by minch February 28, 2003
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1. Expression: a distinctive way of communicating your dissatisfaction with the situation. Draw out "third", emphasis on "rail"
That dumb fuckin bitch at Food Lion took twenty minutes to run a price check on my shrimp flavored Ramen. Thiiiiiiirrrrrd RAIL!!!!!!!!!!
by DBo February 28, 2003
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The term THIRD RAIL commonly is a low pro way of refferancing one's Cock, mostly used when talking directly to or within ear shot of some bitches. Can be used to insult, make fun of with out them really catching on, or as a little bit of "verbal bling" while telling a story.
"sup, you ladies down with the trird rail or what?"

"third rail clothing co."
by JOSH motherfuckin ALLEN February 15, 2009
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An exclusive group of individuals which have engaged in intimate encounters with strangers while on board a passenger train, most commonly in the bathroom compartment of the train; similar to the Mile High Club.
Gloria met a very special gentlemen on board the 4:15 Amtrak from Penn Station to Providence last month, and she was delighted to have joined the Third Rail Club with him. He still hasn't called.
by BostonBaller September 11, 2009
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