Butternipple 

Generally refers to a nipple which is slippery. Commonly used in S&M circles to describe a nipple which is difficult to attach objects to.

During our first S&M class, I couldn't clamp a clothespin on my girlfriends butternipples so I clamped it on her earlobe instead.

Butternipple by butterman May 28, 2012

Buttnipple 

The name for a pimple on a person's butt. Making that person's butt look like a breast. Usually in the middle of the cheek. Impossible to talk about and impossible to sit on.

*John's thoughts sitting down at a restaurant during an important date*

Oh god. That is very uncomfortable. Ah. Don't make a weird face she is hot. Okay lets just hope we don't go back to her apartment. I can only imagine her face once she sees my buttnipple.

Buttnipple by thebrick916 August 18, 2013

buttnipples 

When your two butt cheeks have nipples on them.

Man, when i was doing Sara I saw she had huge buttnipples.

buttnipples by HeaftyTony April 14, 2010

ButterNipples

When an individual's nipples milk for a long period of time without getting wiped off leaving a buttery looking substance on the nipple and/or around the nipple

Sabbatha had ButterNipples while she was pregnant

ButterNipples by VomitCock May 27, 2017

Butter Nipple 

when you can see pretty much everything but-her-nipple.

Did you see that girl's butter nipple? Her shirt was undone so far you could see everything but her nipple.

Butter Nipple by Shaun Taylor! December 18, 2009