When a man initiates unprotected sexual intercourse with a sub-par class woman but - when he pulls out his penis - he is wearing a rubber (from the collection of old-dirty-discarded condoms in the woman's vagina). The phenomenon is like a battle between the penis and vagina, similar to a hockey fight, where the vagina "dirty jerseys" the penis with a condom and hence wins the fight.
That girl I had sex with while camping on the weekend gave me a dirty jersey! GROSS!
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