When one puts an item of clothing, eg a T-Shirt, over ones stomach to catch any stray spoog when knocking one out.
My girlfriend didn't suspect a thing until she found my used Jizz bib under the sofa. She had to tear it off the upholstery.
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a gay man's burly beard. Also known as "cum catcher."
"Man, my jizz bib is gettin crusty!"
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