look up any word, like ratchet:
 
1.
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.
by Matty Boy March 09, 2004
 
2.
a gay man's burly beard. Also known as "cum catcher."
"Man, my jizz bib is gettin crusty!"
by ed hart April 26, 2006