Similar to beer jacket, cock jacket describes an invisible coat that allows females to endure ice-cold external temperatures whilst wearing tiny outfits (usually akin to lingerie), pre-alcohol, simply because the lengthy process of removing a coat/jacket in the pub/bar/club would waste good cock-teasing time. Cock jackets are particularly popular in Newcastle and Liverpool, England.
"Look at that girl in the miniskirt and boob tube! She much be freezing!"
"She's probably wearing her Cock jacket"
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