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An individual who runs through a city’s transit tunnels with the intent of exploration, tagging or escape while dodging security patrols and trains.
"The police have been arresting any tunnel runners they catch trespassing in the subway system."

"Fucking pigs chased me while i was doing a tunnel run last night."
by Mista Scribbler June 06, 2003
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2
1.A fan of horrocore producing music not on psychopathic records

2.Compilation album released by hatchet house a sub label
I'm a tunnel runner trying to make it to hatchet
by dm_lgl September 04, 2016
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