Top Definition
This phenomenon occurs when a person's nipples are so long that they resemble a spark plug, and so dark that they appear to be rusty.
Things were going well until her rusty spark plugs were staring at me when she took off her shirt.
by humblemonkey42 February 07, 2011
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.

×