1 definition by Lil' Wendt
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.
My dog Woody has a big grunu.
I love to pull on Woody's grunu.
by Lil' Wendt January 3, 2011