A female version of "Cock Blocking". If a girl is out with a guy or girl and prevents them from getting lucky due to something they do, or just by being there.
Dave - Why am i having no luck tonight with girls tonight?!?!?
Tracey - Oh, that might be my fault, inadvertent Great wall of Vagina. All the girls must think you're with me.
Dave - Well fuck off then! I want to get lucky!
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