A slang term mainly used by atheists, satanists or those who don't respect religion. It is used to degrade another person that is basically either a god freak or a pussy in general. Can be used as an improper adverb to describe an action or an adjective to describe a person as described above. Can be used to replace gay or fag.
"Dude, you never laugh at any Jesus jokes, you're such a fucking pussychrist."
"Wow, the way you do that is so pussychrist.. Just stop fag."
The term cotton is reflective of an absorbant material. Much like the term cottonmouth (dry mouth / the mouth which is dry), pussycotton refers to quite literally dry pussy. Which in turn is reflective of pleasure, or in this case a lack there of.