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A term used to describe a less than attractive woman who may be up for a bit of action. A word play on "rough tunnel" to highlight the roughness that would be experienced while fucking her. The phrase originated amongst Australian rugby players in the 1980s and has since become popular in the UK.
Guy1 in bar: Look at that one over there with all the makeup on

Guy2: She's a real tough runnel
by barely21 November 06, 2006
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