Keeping your thighs tightly squeezed together when sitting on a chair or in a car to prevent the pungent odour of a fart escaping.
"Your looking a little tense there, Fred."
"Nah, I'm just doing a thigh trap so the ladies can't whiff my fart. I'll relax once the smell has dissipated."
by Teivovo Dog December 09, 2011

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