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n.
The notable discrepancy between the attractiveness of the sort of lesbians depicted in grumblevids, seed catalogues etc., and the sort acually encountered in real life.
"Did you see that lezzer documentary last night?" asked Ted.
"Yeah, I did" replied Arthur, "It really drove home the dyke differential"
by SamThatBlokeInBognor May 19, 2005
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