Top Definition
The conglomeration of greasy substance that builds up between the ass cheeks after a particularly long day and resembles the smell of a shart. Occurs most often after it has been greater than 8 hours since a shower and is one of the substances to be removed whilst participating in a hooker shower.
"Girl, I had so much knap butter in my crack last night my thong was greasy!"
by shuddddders October 07, 2009
5 Words related to Knap Butter

Free Daily Email

Type your email address below to get our free Urban Word of the Day every morning!

Emails are sent from daily@urbandictionary.com. We'll never spam you.

×