To be pregnant
"Your Mum is always up the Jill"
"I can't believe she's up the Jill again"
The action of vaginal discharge seeping onto cotton (or any other type of) knickers. Can also be used to describe the smell of an unclean lady garden.
Andie: "Darling, I think I might have an infection... Look..."
Sue: "Errrr fish on cotton!"
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