When a girl straddles her male partner and rubs her pussy on and along the underside of his erect penis, without actual vaginal penetration. May be an adjunct (foreplay, playful coital interlude, serious clit mashing) or alternative to coitus.
Kimmie wants to keep her hymen, but she loves 69ing, anal, and riding the rail.

I love Tina double-edging us by riding the rail, so we supplode together when she finally shoves it in.
by insidiot May 26, 2019
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To be penetrated by a strap on.
I used to ride meat dicks but got tired of dealing with the men attached to them. Now I just ride the rubber rail.
by aeron_chairgaryen January 12, 2023
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A railriding slut is a dishonest woman that only likes to ride dick whenever she can.
Omg Kaylie, Kaitlynn is such a Rail-Riding Slut
by MickeysTrapHouse June 22, 2019
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