An item of clothing (or similar) that has been repurposed for the sole use of catching and/or cleaning up freshly-jizzed semen.
Mate, don't touch that thing! It's Steve's blow rag!
someone whose sole purpose is for your sexual gratification
I don't want a relationship with her; she's just a blow rag
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Blowing your rag means a woman get's angry while on her period.
Woman: "Just shut the fuck up!"
Person: "Okay, okay, stop blowing your rag!"