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The organ used for anal sex. Generally heterosexual.
"I think I'll go for a run (or gallop) on the tan track".

Usage is jocular as it can be a double entendre, especially among horseracing enthusiasts.

See also "false rail", as used in the following example: "we had the false rail out last night."; and "Greek".
by Gauci November 22, 2006
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