Top Definition
When a women watches either a really scary film or a bit in a film which has a tense or climatic part to it, tends to clench her fanny together tight from excitment and nerves. The women may also squeeze her thighs tighly and also her asre cheeks too.
' Oh my god i couldnt keep still watching that film, it was so fanny clenching'
by Carina Crolla February 16, 2005
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