A person who whines excessively about a common, everyday occurrence that the vast majority of people have no trouble handling or do not even recognize as a problem.
John is such a cockbib; he can't enjoy oral sex because he's too worried about getting spit in his buttcrack.
A cloth or plastic sheath that has a hole, and when the penis is placed through it, protects the groinal vicinity from unwanted skin-to-skin contact during intercourse.
Sometimes when engaging in coitus with a female from origins unkown, it is prudent to wear a cockbib to protect the inner genitals and vicinity from unwanted torso contact from the aformentioned female.
Example: Man, I was at this Bulgarian brothel, and they had a wide array of condoms and cockbibs to use. I was so releived!