A prolonged period of time at a music festival can cause a great deal of sweating, drinking; therefore urinating and exposure to mud and piss-filled pints of beer.
The combination of these things can lead to a rather unpleasent aroma developing in the vaginal area; an odour which will remian for the duration of the festival due to the lack of adequate showering and general hygiene facillities.
Thus, girls may suffer from the well known phenomenon termed "a muddy minge".
Deeksy- "Fucking hell. I shagged this girl at Leeds Fest last year but I refused to go down on her."
Some guy- "Why man?"
Deeksy- "She had a right muddy minge!"