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fanny webb has two meanings, the first being dirty sex juices that have been left and dried up.

the second meaning is, when a woman has not had any sexual activity for a while hence the webs in her vagina.
"oh fuck, i better fucking clean me up cause im dirty as shit... iv well got fanny webb."

"ever since i caught the aids all iv been getting down there is fanny webb"
by john abdhule September 16, 2008
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