A very saggy pair of woman's breasts.
Mate, she had tits like a slate layers nail bag.
by lennylightweight March 29, 2006
Old saggy tits / labia, that are stretched to the extent of looking like a well-seasoned slate layers' leather nail bag.
"cor, she's got tits like a slate layers' nailbag"
by haliborange October 24, 2009