Top Definition
A bonnie lass whom one boy meets on a British Rail Intercity just before the festive season. A random conversation which leads to further conversations years down the line so to speak.
"I need a Random Train Girl" The meetee then aquires the name Random Train Boy. Thus becoming RTG and RTB to each other. Fondness ensues in these titles and each tickle the others heart warmly.
by RTB July 28, 2003
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