An oily feeling, usually a result of not showering for a week.

Sexual experience that gets ridiculously crazy

To keep it greasey is to do the perform the prep work for anal sex.

to get someone to butter you up and then to name you greasey

When you stick a heroin spoon and stick it up your butt before taking in the ass by a lubed up person. The heroin gets absorbed by your rectum and colon.