The extra flabby skin on a persons (or Animals) neck. The grunu is similar to a scrotum sack, only found on neck.
Old people tend to have excessive grunu's

My dog Woody has a big grunu.

I love to pull on Woody's grunu.
by Lil' Wendt January 02, 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.

×